Just got through your Thermodynamics playlist and I've got to say thank you. You've gotten me through my first semester of Physics and now my 2nd. Your videos are extremely helpful. THANKS
I've watch all your videos, i just wanna say Thank you so much! now i feel so eager to learn about thermodynamics. Wish i could passed the exam! :) you're such a great professor!!!! thank you!!
thank you soo much for this! i didnt understand the first law of thermodynamics, with the formulas changing depending on the state. i never knew i didnt have to memorize the formulas in order to understand. i just have to understand the concepts from your teaching. thank you professor!
Wow this playlist helped me a lot to understand these processes specially now that we are undergoing distance learning. I could not help but thank you, sir. You are an amazing educator.
you're absolutely fantastic. I love your videos. thanks so much!! you're doing what my 'first class, elite' university lecturer couldn't make me do... understand!
A steam turbine in a power station develops 1000 kW power. The amount of heat supply into the boiler is 2800 kJ/kg, and the heat rejection from the condenser is 2100 kJ/kg. The power required to pump the steam to the boiler is 5 kW. Consider the system is stationary and neglect the change of internal energies. Applying the energy balance relation above, calculate the rate at which steam circulates through the network of the power plant.
there is a piston with steam cylinder,expands isothermaly and reversibly , in this case does the change of internal energy can zero or not? can u please help
Isotherm, means the same temperature. If the temperature doesn't change then there cannot be a change in internal energy, since the internal energy only depends on temperature.
+Michel van Biezen Have you done a video explaining why Cv is always used when using delta U? I mean explaining in detail why this is the case because it's not intuitive to me.
+PR Mesler Watch the rest of the playlist and you'll get the information. I know this is a source of confusion because students confuse the Q in the first law of thermodynamics with the U. Note that U is the internal energy of the gas and it cannot depend on how you got there. Q is the heat gained or lost by the gas. The amount of heat does depend on the process during which the heat is exchanged. The best way to look at it is to take an isovolumetric process. No work is done because the volume of the gas doesn't change. Thus delta U equals Q which is n*Cv *delta T. In an isobaric process delta U is NOT equal to Q which is then n*Cp *delta T.
+Michel van Biezen So, are you saying that it doesn't matter if you have an isobaric, isovolumetric, isotherm,etc. process, delta U always uses Cv as the molar heat capacity?
A vessel has two compartments of volume V1 and V2,containing an ideal gas at pressures P1 and P2 and temperatures T1 and T2.if the wall separating the compartments is removed,what will be resulting equilibrium temperature
That is indeed an interesting problem. We are assuming here that both gases have the same specific heat? Then the final number of mols becomes nf= n1 + n2 and the final volume becomes Vf = V1 + V2. Thus Pf/Tf = nf * R / Vf, but that leaves you with a ratio. Next you can use the sum of the internal energies. U = n Cv T and thus Uf = n1 Cv T1 + n2 Cv T2 = U1 + U2 From here the final T can be calculated to be Tf = (n1 * T1 + n2 * T2) / (n1 + n2)
Thank you all for comments. It is great to see that these videos are helping.
I'm 48. I did not have this clarity when doing my engineering. Great teachers are a rarity, but in you, the internet has found a wonderful teacher!
Thank you so much for your kind words. Glad you are enjoying the videos.
Just got through your Thermodynamics playlist and I've got to say thank you. You've gotten me through my first semester of Physics and now my 2nd. Your videos are extremely helpful. THANKS
Thanks for the feedback.
I've watched all the 22 videos & I fully understand the whole subject now. Thank you, sir!!
Hands down the best lectures on thermodynamics on the net!! You're amazing.
I'm so happy that you take the time to educate us when our professors fail to do so. Thank you
I've watch all your videos, i just wanna say Thank you so much! now i feel so eager to learn about thermodynamics. Wish i could passed the exam! :) you're such a great professor!!!! thank you!!
thank you soo much for this! i didnt understand the first law of thermodynamics, with the formulas changing depending on the state. i never knew i didnt have to memorize the formulas in order to understand. i just have to understand the concepts from your teaching. thank you professor!
You're very welcome!
Wow this playlist helped me a lot to understand these processes specially now that we are undergoing distance learning. I could not help but thank you, sir. You are an amazing educator.
Thank you for writing. We are glad you find the videos helpful.
you're absolutely fantastic. I love your videos. thanks so much!! you're doing what my 'first class, elite' university lecturer couldn't make me do... understand!
mellow whlzki I am glad these videos are helping. Keep you your studies.
great vids!! I enjoyed the whole series. Thanks
I enjoyed the whole series too !!! Thanks a lot sir !
Timothy William Great! Thanks for letting me know.
I wish we could have a professor as awesome as you! These videos are very helpful!
Cannot describe in enough words how much these series helped me with thermodynamics. Thank you. Undergrad :)
You make learning fun and enjoyable!! Thanks a lot.
You deserve an award🎉
Thank you. Your nice comment is the award! 🙂
thank you sir,you really helps me alot,which me luck on upcoming thermodynamic paper
Good luck on your paper!
Thanks very much. You have helped me when others couldn't!
Thank you. Really helpful ! I believe I've got 90% of understading. there other 10% is for practices.
they are very helpful videos. Thank you very much
A steam turbine in a power station develops 1000 kW power. The amount of heat
supply into the boiler is 2800 kJ/kg, and the heat rejection from the condenser is
2100 kJ/kg. The power required to pump the steam to the boiler is 5 kW. Consider
the system is stationary and neglect the change of internal energies.
Applying the energy balance relation above, calculate the rate at which steam
circulates through the network of the power plant.
Could you help me with this if possible? Thanks
Thanks for your great explanation
You are welcome!
Thankyou for doing this series
thanks a lot! your 22 videos is very helpful ...
These videos are very helpful>>>Thanks a looooot!!!.
Great stuff
Thank you for your comment. 🙂
You sir, rock! Thanks a lot for the videos
Thank you so much !!!!
Glad to be of help. 🙂
Sir do you have video of polytropic process?
No we don't
awesome sir!
there is a piston with steam cylinder,expands isothermaly and reversibly , in this case does the change of internal energy can zero or not? can u please help
Isotherm, means the same temperature. If the temperature doesn't change then there cannot be a change in internal energy, since the internal energy only depends on temperature.
Thank you very much
You are welcome
Amazing series! :)
Glad you think so!
I am a little confused. In the first isobaric example, shouldn't you be using Cp, not Cv for the molar heat capacity in the delta U equation?
+PR Mesler
To calculate the molar heat capacity for the delta U, you must always use Cv regardless of the process.
+Michel van Biezen
Have you done a video explaining why Cv is always used when using delta U? I mean explaining in detail why this is the case because it's not intuitive to me.
+PR Mesler
Watch the rest of the playlist and you'll get the information. I know this is a source of confusion because students confuse the Q in the first law of thermodynamics with the U. Note that U is the internal energy of the gas and it cannot depend on how you got there. Q is the heat gained or lost by the gas. The amount of heat does depend on the process during which the heat is exchanged. The best way to look at it is to take an isovolumetric process. No work is done because the volume of the gas doesn't change. Thus delta U equals Q which is n*Cv *delta T. In an isobaric process delta U is NOT equal to Q which is then n*Cp *delta T.
+Michel van Biezen
So, are you saying that it doesn't matter if you have an isobaric, isovolumetric, isotherm,etc. process, delta U always uses Cv as the molar heat capacity?
+PR Mesler That is correct.
GOD BLESS YOU!
Thanks a lot ......
thank you!
Do I always need to convert liter to cubic meter with these processes?
It is recommended
A vessel has two compartments of volume V1 and V2,containing an ideal gas at pressures P1 and P2 and temperatures T1 and T2.if the wall separating the compartments is removed,what will be resulting equilibrium temperature
That is indeed an interesting problem. We are assuming here that both gases have the same specific heat? Then the final number of mols becomes nf= n1 + n2 and the final volume becomes Vf = V1 + V2. Thus Pf/Tf = nf * R / Vf, but that leaves you with a ratio. Next you can use the sum of the internal energies. U = n Cv T and thus Uf = n1 Cv T1 + n2 Cv T2 = U1 + U2 From here the final T can be calculated to be Tf = (n1 * T1 + n2 * T2) / (n1 + n2)
Thankyou so much sirI
Thankyou sir
thaaaaaank you you are awsome
ISOVOLUMETRIC IS SAME AS ISOCHORIC RI8??
+NIKHIL STEALTH
Yes, isovolumetric is the same as isochoric
respect ^^