Hey everyone! 😃 If you're interested in more thermochemistry content, check out my thermochemistry playlist by clicking the link below 🔗👇 kzread.info/head/PLJ9LZQTiBOFElT2AQiegNrp-cwXaA0mlK

@tylerriles3124

15 күн бұрын

I gotta say, as an HVAC tech working in the field trying to get a better understanding of enthalpy, you saying pressure is generally constant and work doesn't matter made this almost irrelevant to the real world application. This seems like a way to calculate how much an uninsulated window heats a house. Very frustrating.

Ben, congrats, this is the most clear explanation about enthalpy I have even seen. I am a chemical engineer and people in my field just take for granted the word enthalpy but most of them do not understand the real concept (including me until today). thanks for your work doing such educational videos all the best from Germany

@BensChemVideos

3 жыл бұрын

Thanks for your kind words! Much love from the USA! 😃

I spent a whole evening to find a clear definition. Finally, I got it. Thank you very much.

@BensChemVideos

2 жыл бұрын

You're very welcome! Thanks so much for watching 😀

Its my first year in college and I LOVE YOUR VIDEOSSS i finally understand chemistry :)

@thelegendofpro8038

2 жыл бұрын

Bruh I’m studying this in my end of middle school

@labsongtv3315

2 жыл бұрын

Until today im still in college.. 😂😂😂😂😂

@killua9369

Жыл бұрын

Have u graduated?

@Greem877

Жыл бұрын

Where are u now

This was sooooooo useful! You explain things in a very clear way and it all make sense ❤❤❤❤❤❤❤❤❤please don't stop posting okra

There's thousands of videos that gives an intuition of entropy but this is the only that I found that gives, in the first minute, an idea of why is enthalpy useful. Thanks.

@BensChemVideos

2 жыл бұрын

Thank YOU! That's really helpful feedback! 😀

I love your videos, they're excellent!!

Thank you! Great explanation! Will help with my Climate Reality Presentation!

Great Explanasion

@BensChemVideos

2 жыл бұрын

Thanks! 😃

Thank you so much. Your description was clear and it was very helpful for me.

@BensChemVideos

2 ай бұрын

You're very welcome!

Nice video.. Thank you

Thank you Ben.

Awesome content! This explained it so clearly, you're amazing at teaching!

@BensChemVideos

Жыл бұрын

Thanks, glad you enjoyed it! 😀

My goodness this was life changing. Thank you!

@BensChemVideos

4 ай бұрын

You're very welcome 😀

Wow, you summed it up in a very easy way!

@BensChemVideos

3 жыл бұрын

Thanks! I'm glad it was helpful 😃

Amazing explanation! Subscribed 😎

@BensChemVideos

2 жыл бұрын

Many thanks! 😃

just wanna say I LOVE YOU! YOU'RE SO AWESOME and helpful with chemistry!!!

Really helpful do you have a video where you go more in detail? I’m suffering through physical chemistry right now and the integrals are killing me it’s super hard to find any physical chemistry stuff on youtube

@Mehdi_Hammar

3 жыл бұрын

You can check the TMP Chem channel, it's very very interesting ;)

Thank you. You made that so easy

@BensChemVideos

4 жыл бұрын

You're very welcome! I'm glad I could help.

this was super useful! thanks!

@BensChemVideos

3 жыл бұрын

You're very welcome! Thanks for watching 😀

Great video, thank you!

@BensChemVideos

2 жыл бұрын

You're very welcome!

Thank you Sir

awesome man! thank you!

@BensChemVideos

2 жыл бұрын

You're very welcome! Many thanks for watching 😀

thanks, clear and useful explanation !

@BensChemVideos

Жыл бұрын

You're very welcome! Many thanks for watching 😀

Thank you so so much!! I finally get it Thank you!!!

@BensChemVideos

2 жыл бұрын

You're very welcome! I'm glad it clicked for ya 😃

Thanks man. It was really helpful

@BensChemVideos

2 жыл бұрын

You're very welcome! Many thanks for watching 😀

Very useful 😃

@BensChemVideos

3 жыл бұрын

Awesome! Glad I could help 😀

Thanks✨

@BensChemVideos

Жыл бұрын

You're very welcome 😀

thanks so much man

@BensChemVideos

3 жыл бұрын

You're very welcome! Thanks for watching 😀

Thanks a lot

@BensChemVideos

3 жыл бұрын

You're very welcome! Thanks for watching 😀

me reading your title for the first time was Benis

@BensChemVideos

Жыл бұрын

Lol nice

What is the meaning of Change in Enthalpy when the pressure is not constant? In some problems deltaH was given directly by n×cp×deltaT even when the process was adiabatic and pressure varied

@carultch

Жыл бұрын

Enthalpy is a state function, that doesn't depend on the path taken. You can heat the gas at constant pressure to give it its full change in enthalpy, and then take an isothermal process to the final condition. Isothermal processes with an ideal gas have no change in enthalpy. This will have exactly the same change in enthalpy, as if you take a process with varying pressure. The heat and work will be different, but the change in enthalpy will not. The change in enthalpy is still useful for such a process. You see this parameter used, in turbines and compressors, where the process ideally is adiabatic. The rate of work done on the gas compressing it (or by the gas expanding it in a turbine) equals the mass flow rate times the change in enthalpy. Since it is an open system process, rather than a closed system process, we need to account for energy through enthalpy, rather than internal energy.

thank you

@BensChemVideos

Жыл бұрын

You're very welcome 😀

Thank you ❤️

@BensChemVideos

4 жыл бұрын

You're very welcome! Thanks for watching!

@athiradas1002

4 жыл бұрын

@@BensChemVideos ❣️

it's not just useful,instead it's tooooooo useful

@BensChemVideos

3 жыл бұрын

Thank you for your kind words, and thanks for watching! 😀

Good explanation! The only thing that bugs me is the capital and lower case letters. I learned that capitals are total values and lower case letters are "per mass". Which means that the q and w should be capital or all the others lower case.

so what does the steam table value gives us mean? Say at 300C and 5bar pressure, the enthalpy value of water/steam is 2534kJ/kg (NOT ACTUAL VALUE). So what is this value? Does it say if we raise the temperature of 1kg liquid at a constant pressure of 5 bar from 0C to 300C, we will need 2534kJ ??

@BensChemVideos

3 жыл бұрын

I don't understand the question. Could you rephrase it?

@carultch

Жыл бұрын

The datum at which enthalpy is defined as zero, is arbitrary. You need to use steam tables with the same reference point. It's common to define it at zero at a point such as 0C and saturated liquid. Refrigeration tables define it at zero at -40C and saturated liquid. It is only difference between enthalpy values in steam tables that means anything. And an application of this, is finding the power produced expanding the steam in a turbine.

really helpful thanks.. my OCD ass tried to scratch that red dot away tho

@BensChemVideos

2 жыл бұрын

You're very welcome! Many thanks for watching 😀

Thank you sir, may Allah bless you

@BensChemVideos

3 жыл бұрын

You're very welcome! Thanks for watching 😀

Wait so enthrall is basically heat released or absorbed under constant pressure???

@BensChemVideos

4 жыл бұрын

Yes, enthalpy is basically the absorption or release of heat under conditions of constant pressure. Thanks for watching!

@jenniferwang946

4 жыл бұрын

Ben's Chem Videos oh thank you so much 😊

@BensChemVideos

4 жыл бұрын

@@jenniferwang946 You bet!

Mr Ben I thought the symbol for Internal Energy was H. I see you are using E. Are we allowed to use E?

@BensChemVideos

2 жыл бұрын

I've seen both "E" and "U" for internal energy. I've never seen "H" used to represent internal energy. It doesn't matter too much what symbol you use, as long as you and those with whom you communicate all agree on terms.

@mysticjaarse

2 жыл бұрын

@@BensChemVideos thank you, I think I was confusing it with enthalpy sorry : )

I’m getting lost at the end. How did we get “w-w”?

Is work always negative even when the surrounding is the one that does work on the system??...

@BensChemVideos

2 жыл бұрын

If the system is doing work on the surroundings, then work is negative. If the surroundings are doing work on the system, then work is positive.

@carultch

Жыл бұрын

The sign convention is arbitrary, and depends on what standards you are using. I'm accustomed to the heat engine standard, where heat added to the system is positive, and work done by the system is positive.

To sum it up Enthalpy is the way to say it is the change in heat. Not exactly but yeah.

@carultch

Жыл бұрын

Enthalpy is the energy needed to create a substance (internal energy U), plus the energy needed to make space for the substance (P*V).

enthalpy ko energy khte h ky

Hi

If enthalpy is only defined for constant pressure then why do they talk about enthalpy in other processes and what does enthalpy mean in other processes

@carultch

Жыл бұрын

Enthalpy is a state function, that doesn't depend on the path taken. You can heat the gas at constant pressure to give it its full change in enthalpy, and then take an isothermal process to the final condition. Isothermal processes with an ideal gas have no change in enthalpy. This will have exactly the same change in enthalpy, as if you take a process with varying pressure. The heat and work will be different, but the change in enthalpy will not. The change in enthalpy is still useful for such a process. You see this parameter used, in turbines and compressors, where the process ideally is adiabatic. The rate of work done on the gas compressing it (or by the gas expanding it in a turbine) equals the mass flow rate times the change in enthalpy. Since it is an open system process, rather than a closed system process, we need to account for energy through enthalpy, rather than internal energy.

High school AP bio freshman’s anyone ??? 😭

I still don't understand

@BOB_VOX

3 ай бұрын

I hope you understood after 7 years

Here 9 years later using this vid to study for my AP chem test🫶 updating later what my score is

@BensChemVideos

3 ай бұрын

Best of luck!

@mr.beehere1808

3 ай бұрын

@@BensChemVideosI PASSED RAHHHH TY BENSCHEMVIDEOS