PV Diagrams, How To Calculate The Work Done By a Gas, Thermodynamics & Physics
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- เผยแพร่เมื่อ 1 ต.ค. 2024
- This physics video tutorial provides a basic introduction into PV diagrams. It explains how to calculate the work done by a gas for an isobaric process, isochoric process, isothermal process, and an adiabatic process. It also explains how to calculate work done for a cyclic process. This video explains how to calculate the work performed by the gas given pressure and volume values in units of Pa and m^3 as well as atm and L. The first problem explains how to calculate work done during an isobaric expansion and the second problem discusses the work done for an isochoric compression. This thermodynamics video tutorial contains many examples and practice problems.
Open Vs Closed Vs Isolated System:
• Open System, Closed Sy...
First Law of Thermodynamics:
• First Law of Thermodyn...
Isobaric Process:
• Isobaric Process Therm...
Isochoric Process:
• Isochoric Process Ther...
Isothermal Process:
• Isothermal process The...
Internal Energy of an Ideal Gas:
• Internal Energy of an ...
_________________________
Adiabatic Process:
• Adiabatic Process - Wo...
Thermodynamics Review:
• Thermodynamics, PV Dia...
2nd Law of Thermodynamics:
• Second Law of Thermody...
Heat Engines:
• Heat Engines, Thermal ...
Converting Heat Into Electricity:
• Thermodynamics - Conve...
________________________
Carnot Cycle:
• Carnot Cycle & Heat En...
Otto Cycle:
• Otto Cycle of Internal...
Refrigerators and Heat Pumps:
• Refrigerators, Heat Pu...
Entropy:
• Entropy Change For Mel...
Heat Engines and Refrigerators Review:
• Carnot Heat Engines, E...
Physics PDF Worksheets:
www.video-tuto...
Final Exams and Video Playlists: www.video-tutor.net/
this guy legit has a video for everything i look for
Exactly
@Eden Justin shut the fuck up
@@baraaahmad7738 damn that's rude...oh did he delete the comment?😂
@@ayemarasool5120 he deleted
As if you know 🤲
I've done my speedrun learning thermodynamics. Wish me luck for the midterm exam 😂😂
You have no idea how many people you have helped graduate.....thank u so much and may God bless you
In problem 6 at around 12:00 I think the answer is wrong. Not sure if someone mentioned that before. "A gas is compressed from 0.01 m^3 to 0.10 m^3" But point A is at 0.10 and point B is that 0.01, but it should be the other way around
The pv diagram should have been an inverted one from this
This dude can always explain things better and faster than the instructor and multiple TAs together can, this cleared up like five absolutely terrible lectures of confusion in a fraction of the time.
You have no idea how useful your channel proves to me..... can’t thank you enough!
give him a donation! better than paying your teacher or a tutor for sure
How come students pay it
Anyways reminding them that they r doing a great job for us may also bring a wider smile
You are welcome
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you're so good man! Who would've told me i was gonna have fun studying thermodynamics?
Your teacher would have told you
In fact, at 13:50, instead of trying to find of n value from the PV = nRT formula, you could just have put the P.V to the place of nRT on the W = n.R.T.ln[Vf/Vo] . if you had put PV to the place of nRT in the work formula, it would have been W = P . V . ln [Vf/Vo] . That formula would give same result for the work, and would be less effortless.
Thank you
* more effortless
Thank you
"Less effortless" as in "more work"? Lol
These diagrams show while we can have a clear understanding of work done and heat transferred, we still need to account for time and sequence. Is there no graphical method of showing the rate of energy flow?
Channel name:
The Organic Chemistry Tutor
content: everything..........
Your videos are the best on youtube by far, you make learning this stuff so easy. You're the best!
There is a mistake in this video. Work performed by who and on WHO? This is not clear from this video. Work done on the gas by the environment is ALWAYS NEGATIVE if it goes through a CW cycle, and it will be POSITIVE if a cycle is swept CCW.
This was so helpful!! Thank you so much ! Turned on the notifications and subscribed!
12:29 I think in problem 6 the P-V diagram is wrong.
I had fun working out the problems when you explained them. Thank you
Sir....i have a doubt....if clockwise....sign is negative or positive...mY teacher said that if anticlockwise work done is positive?plz reply
So we are paying thousands of dollars of tuition to our universities for that one piece of paper they give us when we graduate, we should've paid this guy when he helps us a lot more in a 20 minute video than what our professors do for the length of a whole semester at universities.
hello! i know im late to the party but arent u supposed to use R= 0.08214 if the pressure = atm, and volume = litres?
nah if we wanna calculate the work done in joules we take R=8.3 and for calories we take R=2
i know im late but better late than never
Great video! It helped me a lot.
Btw, what equipement are you using to write? A drawing tablet?
yes.
This video is literally everything you need
Very Very Helpful video bro.. Lots of love and respect from india💝🙏👍
Don’t know what the chances are that you’ll respond but fingers crossed. For Question 6 is A -> B not supposed to be 0.01 to 0.10 as stated in the question? I see the arrow pointing the other way and A and B inverted in graph. I’m not sure. But I also realized that you can’t “compress” from 0,01 to 0,10 (higher to lower) soooo maybe it’s the question..okay never mind. Thanks🤦🏽♀️
In question, he inverted values
Bro is the GOAT
I love the way you explain every small things in short times.
Is it just me or did the adiabatic formula appear out of thin air?
Yes, I'm trying to figure out how to derive it... X.X
During the isochoric process, when pressure is decreased from 4 atm to 2 atm, why is the volume of the gas not increased according to Boyle's law? I mean, how is this process done physically?
In 3rd sum ( 4:36 ) ,
why PV is Not equal NRT
P1V1 = P2V2 = 6*3 = 9*2 = 18 atm L
= 18 * 101.3
= 1823 J
NRT = 5*8.3145*400 = 16629 J
umm
Question 6 description needs to be corrected to indicate the gas compressed from 0.10. Similarly, expands isothermally back to 0.10. Otherwise very well explained.
This may be that Im wrong, but shouldn't the overall work be negative? because fro A->D volume is decreasing and it was the smaller area under the curve. If the volume is decreasing that means that the environment is doing work on the system so Work is (+). But for B->C the volume is increasing- meaning the system is doing work on the environment in order to expand. If the system is doing work then work is leaving the system making Work (-). Because B->C has a bigger area under the curve the total work should be negative. I think you missed that because W=-PDV but you wrote W=PDV. If i'm wrong then just forget what I said haha
I actually agree Lauren. I had the same confusion so I'm thinking he used different conventions for the signs maybe...Maybe he considered work done by the system as positive. So we actually have to reverse his conventions to get ours
18:25 why average pressure..?
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Thanks again man. Why do I feel so confused doing this stuff though? Simple things like Work done ON the gas vs work done BY the gas, gets me tripping
You r the real God! Love from India!!
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Really u are a good mentor . This really helped me in final exams. Thanks from India 🐯🐯🐯👍👍👍😃😃😃
Thank u sir I have never seen a generous person like u
Abuubakar Hassan th-cam.com/video/C7jA08gpNMc/w-d-xo.html Atomic Structure Trick
In problem 7, while calculating the work from C to A, why have we used 1/2[Po+Pf] delV ? Why not nRTln [Vf/Vo] ?
Your sign convention is off... Since the system delivers work, the work is done by the system and therefore negative.
In chemistry, work done by the system will be negative since the system loses energy. In physics, work done by the system is considered positive since the system / engine is putting out energy which can be used to do useful work such as powering an automobile. It all depends on perspective. The sign conventions are different for chemistry and physics.
The Organic Chemistry Tutor Can I ask what CV means? Sorry I really don't know :'(
@@andrewlamberttampoc9581 Cv is the heat required by one mole of a gas to raise its temperature by 1°C (keeping volume constant) ...Cv=R/(¥-1) where ¥ is adiabatic constant of gas
Pramod Nair Ah so it's like molar heat capacity? btw I'm very thankful for the response, I've never ssen Cv before when I took up Thermodynamics so I really had to ask
Yes u r right the chemistry sign convention is off on problem 5
There are many mistakes in the video. In #4 the process is cyclic so the overall work done should be negative(not positive)...there are sign mistakes
Isn’t the formula negative P delta V. The sign conventions are different for physics and chemistry.
Thanks!! It really helped me;)
The work law is -PdV. The sign convention for a system.
Why at last problem he took work done as positive when expanded and negative when compressed that's contardicts
Hol up, in the last problem the total work is 12000J.
[0J+16000J - 4000J = 12000J]
Sir, that was really assom
Pleasant and superb explanation
Thanking U,,,a lot
Is the PV diagram in no. 5 wrong? Because the situation stated from .01 to .10?
bruv how do u know everything its upsetting to me. i look something up, u know it like... ill never be u fr
Is there a video of thermodynamics for chemistry because the workdone signs is different in Chemistry
This was super helpful. Thankyou❤️
Did you miss negative sign for work done due to expansion in the 3rd problem?
How I wish I cud see the face of this man as he speaks, hard to believe he is human!!!!!
In that one example you cannot assume the gass is ideal. You can only say its ideal when mentioned
organic chemistry tutor, if you ever need a kidney transplant hmu
Can someone please explain why when googled the work done formula it comes out as W=-PV (negative pressure) but for PV diagrams we use W=PV (positive pressure) instead?
@The Organic Chemistry Tutor with the example at 4:33 there is no need to convert the volume unit to m3? Because the SI unit for volume is m3.
Very good video but I believe exercise 6 is wrong, it should be the same shape but in the other way. So B should be A, A should be B and C should be above your A. Thanks anyways!!
You have a problem with signs
Could you reply me? I need an answer for last P-V diagram how to find Q and Del U?????????PLEASE CHECK MY COMMENT AND ANSWER ASAP
For the 6th question the diagram is wrong. It should be opposite
Isochoric = Chorus: Think of a chorus standing still on stage
The work done by a gas expanding against an external pressure is negative
#3 you used the wrong r constant. The correct one is 0.08206 if you want to use l-atm. The answer is incorrect
Hello, It seems question nº 6. the graph is inverted.
I had to rewind like 5 times to understand what he means with "liff"... I have never seen someone pronounce length that way. Great video though!
His channel name misleading, else he would have been more famous
You really are a life saver. Can’t thank you enough. A moment ago i was cursing my memory. After watching this now its a piece of cake. All thanks to you. Keep up! Thank you again.
18:30 can anyone explain why pressure are added?
basically work done by each individual process is the area occupied by it. If you extend A and C downward you will see a geometrical figure which is a trapezium. Its area can be calculated directly or you can just sum the area occupied by the rectangle and that of the right triangle(recommended). When you will sum these you will get this result
@@ahmedbilal9553 got it. Thanks
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Why have you not considered sign convention for work done
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The audio is low, it is so annoying. But the information is helpful. This is ridiculous.
Thank you buddy !!!
i have a quiz in 20 minutes thank goodness this video is 20 minutes long
great video, i think tge question #6 on the direction of volume should be oppsosite
why clockwise and anticlockwise direction make the work done positive and negative work?
It is prooved in the example at 9:03. Sum of individual cycles is coming positive which is same as that by direct calculation
You are a gift, this is so helpful on my olympiad journey, thanks!
Who is watching before exam 😂😅👇
In the first question of this video........how to decide whether the work done is positive or not ... if it is any other process or this only
Is the work not W= - p*(Vf-Vi)??
Which app you use to make such videos?
Last class I need is this pchem class to get my degree and this guy has helped me on every other chemistry since its been my major lmao
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Make a video on how to find change in internal energy on pv graph
Its was a nice video
Does this types of questions come in jee mains?
Amazing man
I’m so mad I didn’t watch this video before my physics test rip
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Clockwise is neg and anti clockwise is posi
In question 6, you could've used PV = NRT and directly substituted the value of PV in the nrt place of RHS. right ? Or am I wrong ?
You're not wrong
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Video and teaching is excellent but in middle voice is not clear sir
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16:20 Can anyone explain total internal energy in 7th question process
Please help me..I am gettin confusing of that graph between pressure and volume is how gonna be straight line ..
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