Trending December 2023 # Homekit Weekly: Eve Energy With Thread Support Is My Go # Suggested January 2024 # Top 12 Popular

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Smart outlets are one of the simplest ways to start your smart home journey, and I’ve tried almost all of the ones that support HomeKit. With its new Thread support, the Eve Energy will become my go-to recommendation until other products add Thread supports.

HomeKit Weekly is a series focused on smart home accessories, automation tips and tricks, and everything to do with Apple’s smart home framework.

Regardless if you’re new to HomeKit or a seasoned user, you might not be familiar with the Thread protocol, so let’s catch up, so we’re all on the same page.

At a 40,000-foot view, Thread networking is a mesh networking protocol for HomeKit and other smart home devices with direct peer-to-peer communication and is self-maintaining and self-healing. Even if a smart home device goes off, other devices will still be kept alive, and the network will automatically reconfigure itself as needed.

Many of the technical aspects of smart home devices weren’t necessarily designed originally to be extremely responsive and operated in a crowded environment. With Thread, everything is designed from the ground up with the smart home in mind, which means a special focus is made for low power usage –especially for battery-powered devices.

A Thread network consists of two types of roles: routers and endpoints. And this role is not permanent – if a device is capable of routing, it can be either, depending on the current network situation and use case. Each device on a Thread network is called a node. Eve has a very in-depth article on all the technical details of Thread, but TL;DR, it’s going to be a great technology for HomeKit as more devices support it.

Eve Energy

I’ve long had an appreciation for Eve’s product lineup. Are they always the lowest cost? No, but they are among the most reliable and have a great build quality. The Eve iPhone app might rival Apple’s own Home app as the best way to interact with HomeKit as well.

The new Eve energy doesn’t look a lot different than the old one, but, of course, the secret is in what you can’t see. Smart outlets are useful for turning “dumb” devices into smart ones. You could use them to trigger lamps, turn off your washing machine when water is detected (paired with a floor sensor), turn on white noise machines at night, or really anything that has a hardware off and on switch (oil heater, etc). They’re easy to install and easy to relocate in the future. One of the most common use cases is turning Christmas tree lights on and off during the Christmas season. Using HomeKit, you could turn lights on at a certain time, using Siri on a HomePod mini, or use the Home app to manually turn them on and off. If you don’t own a single smart home product today, smart outlets are the place to start.

What difference does Thread make today?

Eve Energy can act as a Thread router, and so can the HomePod Mini and Apple TV 4k.

Eve devices that support Thread

The Eve Door and Window, Eve Weather, and Eve Aqua join Eve Energy as Thread enabled supported devices.

Installing Eve Energy

Installing Eve Energy with Thread is so trivial that a child can probably do it. Unbox, plug it into the wall and scan the QR code on the side of the unit with the Home app. One minor detail I appreciate about this product is how the QR code is on the side of the outlet. I’ve used some products in the past that are on the back, so it’s tricky scanning it while it’s plugged in.

Use the Home app with Eve Energy

Once the device shows up in the Home app, you’ll have full access to turn it on and off via Siri and using the Home app. One detail Apple supports for smart outlets is setting them to appear as a light, outlet, or fan.

With something like a switched outlet connects to a lamp, a simple automation is to have it turn on at sunset and turn back off at sunrise. If you have a HomeKit enabled motion sensor, you could create an automation where when the motion detector detects motion, it turns the light on but turns off after a few hours. I personally use a motion sensor at the top of our steps to turn on a lamp when motion is detected from 11:00 PM to 6:00 AM, as that means our kids are coming down the stairs.

Wrap up

I am beyond excited to see Thread-enabled devices coming to the market. Eve is getting out ahead of other manufacturers, and I’ll be choosing Thread-enabled devices when I have the option in the future. If you’re looking to start building out Thread support in your home, check out Eve Energy.

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You're reading Homekit Weekly: Eve Energy With Thread Support Is My Go

Homekit Weekly: Four Ways To Control Cooling With Fans And Air Conditioners

HomeKit Weekly is a series focused on smart home accessories, automation tips and tricks, and everything to do with Apple’s smart home framework.

We’re halfway through August, but summer doesn’t feel anywhere near like letting up: it’s hot outside! Luckily there are lots of ways to keep cool indoors — including four methods that work with HomeKit and Siri. Controlling cooling with HomeKit doesn’t have to be expensive either.

Smart Plug + Fan

Connecting a floor fan or window A/C unit to a HomeKit smart plug is the easiest and cheapest way to control cooling with Siri. Any model of the iHome Smart Plug that works with HomeKit for under $30 is my preferred smart switch.

In my office, I connect an iHome Smart Plug to a small flat panel Vornado fan set to its highest speed. In the Home app, you can assign the plug type as a fan (versus light or outlet) so Siri knows it’s connected to a fan and the accessory icon can match.

My house has a back porch area that is indoors but lacks central cooling, unlike the rest of the house. A basic window A/C unit was already installed when I moved in, so I simply added a HomeKit smart plug to the setup and assigned it as a fan to make it easily controlled by HomeKit as well.

This approach is super easy, relatively inexpensive, and made better by the Home app’s ability to assign smart switches as fans for proper support. The only real downside is missing out on fine tuned controls like changing target temperature and fan speed.

Also note that this works with any fan that works as soon as it’s powered on if left in the right mode; some fans require additional interaction to work but you can test before buying a smart switch by just unplugging and plugging the fan to the power source.

Smart Ceiling Fan

If you want more control, consider a HomeKit connected ceiling fan. Hunter Connect (reviewed) is my go-to solution. You get all the functions of a standard ceiling fan including speed and direction control, an integrated LED light, and a wall-mountable remote — plus complete Siri and Home app control.

Speed options include 25%, 50%, and 100% intervals, spinning direction can change between clockwise and counterclockwise (clockwise for winter to redistribute warm air; counterclockwise for summer to create a cool downdraft), and the integrated LED light appears in HomeKit as a separate accessory.

Expect to pay around $300 and installation is required, but the result is tremendous convenience — especially if you have a HomePod in the room for voice control. There’s nothing cooler than laying in bed, deciding it’s too hot and you’d prefer the fan on, and turning it on at your desired speed without moving a muscle.

Smart Thermostat

A more common and medium-priced option is a smart thermostat that works with HomeKit. I personally use an ecobee 4 (reviewed) that features built-in Alexa integration, but the cheaper ecobee 3 lite is my recommendation if HomeKit control is your primary goal.

Smart thermostats let you control your HVAC system using iOS apps, Apple’s Home app, and Siri so you can switch between heating and cooling, set the desired temperature, and toggle your system on and off without ever touching the thermostat — you can even control your HVAC system away from home.

Other smart thermostat options work with HomeKit too, but I prefer ecobee and its expandable sensors for measuring temperature and presence by room. Installation is required, but this is generally a one-and-done experience.

Smart Window A/C Unit

The last option is a newer solution we’ve seen come to market recently: smart window A/C units that work with HomeKit. Priced at $279, the GE AHP08LX, an 8,000 BTU unit, has been exclusively available from Lowe’s since spring. Larger (and pricier) 10,000 BTU and 12,000 BTU units are also available now. This solution costs a bit more than the quick and easy smart plug approach, but you get much more control than just on and off. Setting up the GE unit is also super easy.

Simply unbox it, connect it to power, scan the HomeKit set up code on the side, assign the unit to a room in HomeKit, then you’re set. In addition to using Siri and the Home app to turn the window A/C unit on and off, you can also adjust the target temperature. GE’s iOS app and physical remote offer more programming options like fan speed and energy mode.

I can definitely say the proper HomeKit experience it offers is worth your consideration. It’s extremely simple to set up (you don’t even need to install GE’s app) and controlling it with voice is straightforward.

Catch up on earlier HomeKit Weekly entries below:

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Review: Elgato Eve Motion Is A Standalone Homekit Motion Sensor For Triggering Automations

Elgato Eve Motion is a standalone motion detection sensor that’s compatible with Apple’s HomeKit feature. Eve Motion can be used as a sensor in iOS 10’s Home app to trigger scenes and control accessories.

When added to Apple’s Home app, Eve Motion ($49) appears just like other HomeKit motion sensors. You can see when sensors are armed and ready, when sensors are activated by motion, and check values like battery level and charging status.

You can optionally enable notifications for motion sensors including Eve Motion so the Home app sends you an alert each time motion is detected, but for me the value is mainly in using Eve Motion as a trigger for automation. For example, you can use Eve Motion to automatically turn on a HomeKit lamp when motion is detected after sunset with a few steps.

From the Automation tab of the Home app, select Create New Automation then tap A Sensor Detects Something. From here you can select Eve Motion as the automation sensor, then select which scene or device you want to react when motion is detected. After you make your selection, you can toggle on the option to trigger the automation only after sunset and set the state of what you want controlled (like lamp on at 100% brightness) then tap Done to save the automation.

Eve Motion works reliably as a motion sensor, but you may want to increase the sensitivity. In testing, I found that I could enter my office in the dark for several seconds without triggering Eve Motion (Elgato promises 2 second response time) and automatically turning on the desk lamp when using the default sensitivity level. After some poking around in Eve’s companion app, I turned up the sensitivity level from low to high (and there’s a medium level too) which noticeably helped.

Eve Motion relies on Bluetooth Low Energy for connectivity and runs on two AA batteries so increasing the motion sensitivity likely negatively impacts battery life.

The biggest issue for me with motion sensors and automation in Apple’s Home app is what appears to be a missing feature in my experience. It’s easy to turn a light on when motion is detected, but Apple’s Home app doesn’t appear to support automatically turning a light off when motion is no longer detected. (If this is supported in Apple’s Home app, I’m not aware of it and haven’t discovered it.)

Ideally, I’d like to be able to turn off the desk lamp if no motion has been detected for, say, 30 minutes. This may be possible when configuring automation through Eve’s companion app, but my interest is primarily in configuring Apple’s Home app and not managing a folder of accessory apps.

Physically, Eve Motion is the same size as other Elgato smart sensors (80 x 80 x 32 mm) like Room and Weather, but larger than Ecobee’s remote sensors with motion detection and HomeKit support. Eve Motion can be placed on a flat surface and stand on its own without using a stand, or Eve Motion can be mounted on a wall.

Elgato promises a 120º field of view and 9 meters or 30 feet range when mounted 2 meters or 6.5 feet above floor level.

In practice, Eve Motion works on par with Ecobee’s remote sensors which were recently updated to support HomeKit as motion (and temperature) sensors. The main difference is that you need an Ecobee 3 thermostat ($249)to use Ecobee remote sensors (2 for $79).

I haven’t tested Eve Motion for long enough to gauge battery life, but my other Elgato sensors powered by AA batteries generally last 2 to 3 months before needing new batteries so that’s something to consider as well. [Update: Elgato actually documents battery life by product here; Eve Motion is rated for over 1 year whereas Room is rated for the 3 months that I’ve observed. Updating batteries annually is reasonable and good to learn.]

At this point, Eve Motion and motion sensors in general are more experimental than essential in my HomeKit setup. Lights, locks, and a thermostat are key accessories, but Apple’s Home app needs to learn a few more tricks before motion sensors are as useful as they could be for me personally.

Still, if you’re interested in HomeKit and want to see what motion sensors can do for your setup, Elgato Eve Motion ($49) is the standalone motion sensor to purchase.

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Homekit Weekly: Switchbot Button Pusher Can Switch On Dumb Appliances Using Homebridge And Homekit

I’ve joked that if I were “super-rich,” that I’d love to hire someone whose only job would be to hand me a large cup of coffee as soon as I walked out of my bedroom. HomeKit hasn’t let me do that, but it’s getting me close. Read on to learn how I automated my morning coffee based on when motion is detected by my bedroom door using HomeKit, HOOBS, and Switchbot. Read on to learn how to implement, what gear you’ll need, and how to configure in HomeKit.

HomeKit Weekly is a series focused on smart home accessories, automation tips and tricks, and everything to do with Apple’s smart home framework.

Switchbot products needed

To get started, we need to understand what we’re trying to do from a high level. The first thing is building a Switchbot set up in your home. Switchbot’s most unique product is the Button Pusher. For appliances that require a button press to turn on, a standard HomeKit outlet won’t accomplish the goal as turning the appliance on will not start the process. In my situation, my coffee maker doesn’t immediately begin brewing when it’s turned on, so I need a way to push the button from HomeKit.

For the Switchbot side, you’ll need to purchase a Switchbot hub as well so the button pusher can be on your Wi-Fi instead of relying on Bluetooth alone. Once the products are unboxed, download the Switchbot app, and begin connecting them to your network. Then, inside the Button Pusher’s settings, put it in “Press mode.” I set my hold time at two seconds after a bit of testing.

Switchbot API key

You’ll also want to find the MAC address of the Switchbot button pusher. It’ll be found under Device Info under the device’s settings. Again, you’ll need it without the colons, so write it down in the same Apple Note you put the API key.

HOOBS setup with Switchbot

Once the Switchbot devices are up and running on your network, you’ll want to get it configured in HOOBS. I am writing this with the assumption that you’ve already configured HOOBS and connected it to HomeKit.

Inside the HOOBS dashboard, search for the Switchbot Plugin. The certified one is the one I am using, and I would reccomend it to you as well. Once it’s installed, you’ll paste in the API key in the appropriate field.

I then added a Press mode bot and input the BLE MAC Address. In full disclosure, I had a lot of difficulties figuring this section out. The documentation could be better explained, but I finally got it. Unfortunately, I also had a typo in my MAC address which took me a lot of time to figure out.

After inputting the MAC address into HOOBS, the Switchbot Button Pusher showed up in the Home app as a switch. Pressing it triggers the button push and immediately flips it back off. Before mounting it on my coffee maker using the 3M, I tinkered with the placement to make sure it would accurately turn the coffee maker on.

HomeKit automation


Now that I had the Switchbot Button Pusher working in HomeKit, the final step is creating the HomeKit automation. I have an ecobee remote sensor in my bedroom to help with heating and cooling exposed in HomeKit as a sensor.

If you set it upright, when the motion sensor detects movement during the preset time, the Switchbot Button Pusher will start brewing your coffee. Reminder, you’ll need a Switchbot Hub and HOOBS to tie everything together.

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Can My Laptop Support Ultrawide Monitor?

Adding an ultrawide monitor to your laptop can be productive in screen space and image details, whether for gaming or work.

But how would you know if your laptop supports a widescreen display boasted by ultrawide screens?

In general, your laptop can support an ultrawide monitor with a high-resolution display, an appropriate GPU, memory bandwidth and drivers, and reliable display ports (HDMI, Thunderbolt, or USB-C).

Your lower-specification laptop may support an ultrawide monitor, but it will significantly downsize the resolution to fit the image or distort it together.

Undoubtedly, the ultrawide display has many benefits, but they take up a lot of desk space and are a bit expensive.

Read on to find out whether your laptop supports an ultrawide monitor and if getting one is a good idea.

What is the Resolution of an Ultrawide Monitor?

Before jumping on the bandwagon, let us determine what an ultrawide monitor is and is not.

They are wider than taller and usually require high-resolution displays.

A few examples of ultrawide resolutions include:

Common NameAspect RatioResolution






UW5K (WUHD)64∶275120×2160






Similarly, the ultrawide monitor will prefer high-resolution images usually offered by 2K, 4K, and higher.

Anything under will lack the crisp and rich color required for a wider display.

Here is a table outlining different resolutions and the ones appropriate for ultrawide display.

DisplayResolutionCommon Name

720p1280 x 720SD or HD Ready

1080p1920 x 1080Full HD

1440p (2K)2560 x 1440Quad HD (OK for ultra-wide display)

4K3840 x 2160UHD or Ultra HD (OK for ultra-wide display)

Ultra-Wide2560 x 1080, 3440 x 1440 or higherWide or WUHD (OK for ultra-wide display)

Note: Ultrawide monitor uses a combination of various aspect ratios and suitable resolutions (1440p, 4K, or more).

However, remember that running ultrawide monitors will require laptops with higher specifications.

Your laptop would require a decent amount of CPU and graphics processing unit of the video card to playback ultrawide images with full efficiency.

How do you Know if your Laptop Supports an Ultrawide Monitor?

Knowing whether your laptop supports the ultrawide monitor can be tricky yet sometimes straightforward.

Inquire the seller or manufacturer about the maximum display it can support if you buy a new laptop and whether it has the correct specifications to support an ultrawide display.

However, you would need to examine the specs for slightly older laptops.

The specifications may include the laptop’s screen resolution, video card driver and processing unit, refresh rate, and display plug.

Your laptop will support an ultrawide monitor with the desired accuracy as long as the graphics card can display 1440p and has at least one HDMI 2.0, USB-C, or Thunderbolt plug.

Otherwise, the laptops with slightly lower specifications would have to install a dedicated video card on top of the internal video card to get by.

However, it is less likely to support a dedicated video card if it does not have Type-C Thunderbolt 3, Thunderbolt 2, M.2 NVMe slot, mini PCIe, or ExpressCard slot.

The CPU or processing power would not matter as long as you have a powerful graphics card, but running a high-end graphics processor will quickly drain the life out of your laptop.

Hence, a high-end CPU, processing power, and battery laptop are essential to run an ultra-wide monitor.

You can also opt for ultrawide laptops instead. Here are some of our recommendations;

Laptop Specifications Required to Support Ultrawide Monitors

Let us discuss the laptop specification required to support and run ultrawide monitors entirely.

1. Video Card, GPU, and Driver

Without a powerful video card, your laptop will fail to support an ultrawide monitor.

Any modern laptop with a video card that can handle 2K or 4K software decoding and provides fast bandwidth memory (18 Gbps or more) will support an ultrawide monitor.

The minimum GPU required for a seamless ultrawide display is as follows;

Similarly, the high-end video card must have a supporting graphics driver to allow your operating system to use graphics optimally.

Your laptop should already have installed the default driver to get you started.

Otherwise, you should download the latest driver updates from the respective graphics driver website.

2. HDMI or Other Connection

Connection is another crucial factor because supporting ultrawide monitors would require high-speed cables and reliable connection ports.

HDMI cables are standard with many ultrawide monitors; however, older HDMI connections (below 2.0) cannot handle the higher resolutions required by ultrawide monitors.

Here is a table describing different HDMI versions and their specifications.

HDMI ConnectionSpecification

HDMI 1.4Transmits 1080p to 4K but only at 30Hz

HDMI 2.0Offers 18GB memory bandwidth to support 4K at 60 FPS

HDMI 2.0aSimilar to 2.0 but with HDR for vibrant color

HDMI 2.1Supports up to 8K display with dynamic HDR, faster refresh rate, and bandwidth

Alternatively, you can use Display Port 1.3 or 1.4 port which supports 4K display at 120Hz.

Thunderbolt is the latest and most reliable display connector that supports 4K to 8K displays at a higher refresh rate.

Thunderbolt 2 can easily support a 4K monitor, while Thunderbolt 3 and 4 will support UHD display at 60Hz and 120Hz.

Similarly, if the laptop has a USB-C port and the ultrawide monitor has a USB-C port, you can use a USB-C cable to connect them.

Read our blog about whether it is safe to Hot-Plug HDMI Cable to the laptop or monitor.

3. Native Resolution

Your laptop’s native resolution will significantly influence whether you can add an ultra-wide monitor.

The unmatched or lower native resolutions will lead to stretched or distorted images on the external monitor.

However, the laptop’s display resolution differs from its output capabilities.

The laptop screen has no relationship to the laptop’s output capabilities. Most laptops are designed to support external monitors for serious work.

A laptop with a 1080p output resolution can support 2k or higher; however, it should have the appropriate GPU and memory.

Otherwise, get yourself a high-end laptop with a higher native resolution.

Find out how many external monitors can your laptop support with the existing resolution.

Here are some best laptops that support an ultrawide monitor.

How to Connect an Ultrawide Monitor with a Laptop?

Using the ultra-wide monitor with your laptop is pretty simple, assuming it meets all the requirements.

Plugin the monitor into your laptop via an appropriate cable connection (HDMI, DisplayPort, or Thunderbolt) to run the device.

Some ultrawide monitors have built-in wireless connectivity, such as Wi-Fi or Bluetooth.

If the laptop and the ultrawide monitor support wireless connectivity, you can connect them wirelessly.

However, you must define the display resolution and type to start broadcasting the image from the laptop to the monitor.

1. Display Resolution

Most laptops detect the monitor’s resolution automatically and start broadcasting feed in 4K or more.

Otherwise, you would need to change the resolution in the setting manually. Follow these steps to change the resolution on Windows.

Choose the appropriate display from the given option (Choose 2 for an external monitor).

From the drop-down menu, scroll down to “Display Resolution” and choose the appropriate resolution, 2560 x 1080 or 3440 x 1440.

Mac users must open “System Preferences” and choose “Display” to open the settings.

Next, change the native resolution from “Default for display” to “Scaled” and choose the appropriate resolutions.

2. Display Type

Display type refers to mirroring the same display on the laptop screen or extending the image.

From the same “Display Settings,” scroll down to find the Multiple Displays section and choose the appropriate feature.

Voila! Your ultrawide monitor will start broadcasting images in UHD resolution at no time.

Pros and Cons of Using an Ultrawide Monitor

Here is a table describing both pros and cons of choosing an ultrawide monitor.


It offers increased screen space thanks to a high-resolution chúng tôi large display screen takes up significant desk space.

Choose from a flat or curved display for a better viewing angle.Gaming or heavy work done on the monitor will take a toll on the laptop’s GPU.

It is no longer expensive or chúng tôi is still more expensive than budget LED monitors.

Read on to discover the pros and cons of using a 4K monitor for regular office work.

Best Ultrawide Monitors to Buy

Here are a few ultrawide monitor recommendations for you.

Read more to discover the best monitor size for gaming and regular office work.


Your laptop will support ultrawide monitors with the correct specifications, display ports, and cables.

All you need to do is get a laptop that meets the minimum requirement to run the high-resolution display demanded by the ultrawide screen.

However, consider your activity and available desk space before purchasing one.

Related Article: Extend Monitor Setup with KVM Switch or Docking Station.

Difference Between Bond Energy And Bond Dissociation Energy Enthalpy

Chemical bonds are the attractive forces that hold atoms together in a molecule or compound. The strength of a chemical bond is determined by the amount of energy required to break the bond. This energy is often measured in terms of bond energy or bond dissociation energy enthalpy. While these two terms may seem similar, there are some key differences between them.

What is Bond Energy?

Bond energy refers to the amount of energy required to break a specific bond in a molecule or compound. It is the energy required to separate two atoms that are bonded together. Bond energy is measured in units of kilojoules per mole (kJ/mol) or electron volts (eV). The bond energy is always a positive value because energy is required to break a bond.

The bond energy of a specific bond can vary depending on the molecules or compounds involved. For example, the bond energy of a C-C bond in ethane (C2H6) is different from the bond energy of a C-C bond in methane (CH4) because the bonding environment is different. Additionally, bond energies are typically measured in the gas phase, where molecules are not influenced by intermolecular forces.

What is Bond Dissociation Energy Enthalpy?

Bond dissociation energy enthalpy (BDE) is the amount of energy required to break all of the bonds of a specific type in one mole of a molecule or compound, which involves the breaking of all bonds between atoms of the same type in a molecule. The BDE is measured in units of kilojoules per mole (kJ/mol) or electron volts (eV). The bond dissociation energy enthalpy is typically measured in the gas phase because the molecules are not influenced by intermolecular forces.

The BDE is a thermodynamic property, which means that it is dependent on the temperature and pressure at which the measurement is made. It is also a function of the chemical environment of the molecule or compound. For example, the BDE of the C-H bond in methane (CH4) is different from the BDE of the C-H bond in ethane (C2H6) because the bonding environment is different.

Differences: Bond Energy and Bond Dissociation Energy Enthalpy

The main difference between bond energy and bond dissociation energy enthalpy is that bond energy refers to the energy required to break a specific bond in a molecule or compound, while bond dissociation energy enthalpy refers to the energy required to break all bonds of a specific type in a molecule or compound.

Bond energy is measured for a specific bond in a molecule, while bond dissociation energy enthalpy is a thermodynamic property that refers to the average energy required to break all bonds of a specific type in a mole of a molecule or compound.

Another difference is that bond energy is dependent on the bonding environment of the molecule or compound, while bond dissociation energy enthalpy is a thermodynamic property that is dependent on the temperature and pressure at which the measurement is made.

Furthermore, bond energy is typically measured in the gas phase, where molecules are not influenced by intermolecular forces. In contrast, bond dissociation energy enthalpy is typically measured in solution, where the molecules are influenced by intermolecular forces.


Bond Energy

Bond Dissociation Energy Enthalpy


Bond energy is also termed as bond enthalpy and it is defined as the measure of bond strength in a chemical bond. Bond energy is an average value.

Bond dissociation energy is defined as the standard enthalpy change which is required to break a chemical bond.


Bond energy offers the energy needed to form the atoms which are the starting material for bond formation.

Bond dissociation energy provided the energy needed to form free radicals from the atoms which created that particular bond.


In chemistry, bond energy (E) or bond enthalpy (H) is the measure of bond strength in a chemical bond. … For example, the (C-H) carbon–hydrogen bond energy in methane (CH4) is the enthalpy change involved with breaking up one molecule of CH4 into a carbon (C) atom and four hydrogen (H) radicals, divided by four.

For example, in methane molecule, bond dissociation energies for C-H bonds are 439 kJ/mol, 460 kJ/mol,423 kJ/mol and 339 kJ/mol. However, the bond energy of the C-H of methane is 414 kJ/mol, which is the average of all four values.

Further, for a molecule, bond dissociation energy may not necessarily be equal to the bond energy (as for above-given methane example). For a diatomic molecule, bond energy and the bond dissociation energy are the same.


It is denoted by E

It is denoted by H

Bond Formation

It gives the energy needed to form the atoms which were the starting material for bond formation.

It gives the energy required to create free radicals from the atoms which created that particular bond.


In summary, bond energy and bond dissociation energy enthalpy are both measures of the strength of chemical bonds. Bond energy refers to the amount of energy required to break a specific bond in a molecule or compound, while bond dissociation energy enthalpy refers to the amount of energy required to break all bonds of a specific type in a molecule or compound. While these terms may seem similar, they have distinct differences that are important to understand when studying chemical bonding and thermodynamics.

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