What is Enthalpy?

Рет қаралды 91,698

10 жыл бұрын

In this video, we define and discuss enthalpy, which is the sum of the internal energy and the product of the pressure and volume associated with a particular thermochemical process. Under constant pressure conditions, the change in enthalpy of a system is equivalent to the heat absorbed or released by that system.
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Пікірлер: 101

@BensChemVideos 2 жыл бұрын

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

@jonathanuis 2 жыл бұрын

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 2 жыл бұрын

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

@ongphaang5348 2 жыл бұрын

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 😀

@yaqeennawfal1388 5 жыл бұрын

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

@ciaramaeserafica798 7 жыл бұрын

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

@agustinlawtaro 2 жыл бұрын

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! 😀

@earthn1447 5 жыл бұрын

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

@bhaskara.n.k694 4 жыл бұрын

I love your videos, they're excellent!!

@ItachiUchiha-sc2yo 6 жыл бұрын

Nice video.. Thank you

@opmanwingchun 2 жыл бұрын

Thank you Ben.

@littlecesario 4 ай бұрын

My goodness this was life changing. Thank you!

@BensChemVideos 4 ай бұрын

You're very welcome 😀

@dhivyamaalya 3 жыл бұрын

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

@BensChemVideos 3 жыл бұрын

Thanks! I'm glad it was helpful 😃

@brittneywilson3369 9 жыл бұрын

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

@chikeluba 4 жыл бұрын

Thank you. You made that so easy

@BensChemVideos 4 жыл бұрын

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

@afshing3510 Ай бұрын

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

@BensChemVideos Ай бұрын

You're very welcome!

@masaqader Жыл бұрын

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

@BensChemVideos Жыл бұрын

Thanks, glad you enjoyed it! 😀

@richietozier5123 3 жыл бұрын

this was super useful! thanks!

@BensChemVideos 3 жыл бұрын

You're very welcome! Thanks for watching 😀

@khalidali9356 2 жыл бұрын

Great Explanasion

@BensChemVideos 2 жыл бұрын

Thanks! 😃

@Latif.Kakule 2 жыл бұрын

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 😃

@abdelz1617 2 жыл бұрын

Great video, thank you!

@BensChemVideos 2 жыл бұрын

You're very welcome!

@virupannamedikinal Жыл бұрын

Thank you Sir

@cibernerd Жыл бұрын

thanks, clear and useful explanation !

@BensChemVideos Жыл бұрын

You're very welcome! Many thanks for watching 😀

@bic1349 2 жыл бұрын

Amazing explanation! Subscribed 😎

@BensChemVideos 2 жыл бұрын

Many thanks! 😃

@looppaddleanimation9488 2 жыл бұрын

Thanks man. It was really helpful

@BensChemVideos 2 жыл бұрын

You're very welcome! Many thanks for watching 😀

@wukf1 2 жыл бұрын

awesome man! thank you!

@BensChemVideos 2 жыл бұрын

You're very welcome! Many thanks for watching 😀

@rubyrichiez1298 4 жыл бұрын

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 ;)

@AK-op4be Жыл бұрын

Thanks✨

@BensChemVideos Жыл бұрын

You're very welcome 😀

@legend-uj2dp 3 жыл бұрын

thanks so much man

@BensChemVideos 3 жыл бұрын

You're very welcome! Thanks for watching 😀

@MIFZALMOHAMADNAZREL Жыл бұрын

thank you

@BensChemVideos Жыл бұрын

You're very welcome 😀

@User4o3p93ghvjkaehvji 3 жыл бұрын

Very useful 😃

@BensChemVideos 3 жыл бұрын

Awesome! Glad I could help 😀

@MrAminmohamed 3 жыл бұрын

Thanks a lot

@BensChemVideos 3 жыл бұрын

You're very welcome! Thanks for watching 😀

@athiradas1002 4 жыл бұрын

Thank you ❤️

@BensChemVideos 4 жыл бұрын

You're very welcome! Thanks for watching!

@athiradas1002 4 жыл бұрын

@@BensChemVideos ❣️

@casaxtreme2952 7 жыл бұрын

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.

@userr_aa 3 жыл бұрын

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

@BensChemVideos 3 жыл бұрын

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

@stoneguardian9292 Жыл бұрын

me reading your title for the first time was Benis

@BensChemVideos Жыл бұрын

Lol nice

@mizutanishizuku6006 2 жыл бұрын

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.

@ilimselyardm9698 3 жыл бұрын

Thank you sir, may Allah bless you

@BensChemVideos 3 жыл бұрын

You're very welcome! Thanks for watching 😀

@freshgamingreviews 2 жыл бұрын

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 😀

@priyanshuostwal5039 3 жыл бұрын

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.

@josenava4555 7 жыл бұрын

@jenniferwang946 4 жыл бұрын

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!

@shorts28793 Жыл бұрын

enthalpy ko energy khte h ky

@mysticjaarse 2 жыл бұрын

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 : )

@J5izon 10 ай бұрын

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

@VegitaBleEater 2 жыл бұрын

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).

@estherkatentazimba4322 2 жыл бұрын

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.

@slttttt 3 жыл бұрын

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

@jenniferwang946 4 жыл бұрын

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

@josenava4555 7 жыл бұрын

I still don't understand

@BOB_VOX 2 ай бұрын

I hope you understood after 7 years