Thermodynamics part 2: Ideal gas law | Thermodynamics | Physics | Khan Academy
ฝัง
- เผยแพร่เมื่อ 26 มิ.ย. 2024
- Courses on Khan Academy are always 100% free. Start practicing-and saving your progress-now: www.khanacademy.org/science/p...
Intuition of how gases generate pressure in a container and why pressure x volume is proportional to the combined kinetic energy of the molecules in the volume. Created by Sal Khan.
Watch the next lesson: www.khanacademy.org/science/p...
Missed the previous lesson? www.khanacademy.org/science/p...
Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Physics channel: / channel
Subscribe to Khan Academy: th-cam.com/users/subscription_...
[Pa] = N/m^2
+Nuk Tyson cubic? m^3
+Chris Ene i stand corrected
apart from ideal gas law, the other thing I learnt is to always drink water when eating peanuts.
Pascal is N/m^2. That is: Newtons per meter squared.
Thanks for catching that. My brain malfunctions a lot and even more often while recording videos :)
Eating peanuts made you go nuts!
drink some water sal khan
1Pa is 1N/m^2
I do enjoy your videos they are very informative but I can't watch if you keep having walnuts or peanuts without water.
"This is an intresting KHANcept" 7:08
Love your lectures! If I may point just a slight error, pascal is newtons per meter squared. Other than that, I think your lectures are incredibly inspirational.
agreed - pressure applies within 3-dimensional objects but only pushes on a 2-dimensional area. Also, the equation for pressure is indeed force divided by area: P=F/A.
Nonetheless, this is still a very helpful video, especially when it comes to getting an intuition for the subject.
Woh. Thanks for making PV= nRT so intutive! it makes sense now.
@khanacademy If you find the time, add a little balloon comment to the video rectifying the square meters, might help. Cheers for the great videos!
There is a small mistake in the beginning of the lecture. You say the unit pascal represents N/m^3, which, as far as I know, should be N/m^2 (force on a surface).
Great lecture though, thanks very much for this series on thermodynamics :)
1:34 => 0:42 + 1:25 + 3:07 + 3:26 + 8:46
Lol
I was in grade 1 when this video was uploaded
Now I am studying AP
i was 3
1 Pa = N / m²
+Sam Anderson he explains it was a mistake in the next video
"sorry i just ate some peanuts, my throat's very dry" you are so cute
can u give me a timestamp when he says that ?
First time watching your video's and, because you sound american, I have to thank you for using the metric system. I live in Europe and even in my textbook they often use the imperial system.
Funny thing is that in the U.S, we tend to use the metric system for physics and chemistry.
Learning Planche I think my book is 100% translated from an American book and it's like 2/3 metric 1/3 imperial, so you're probably right
@khanacademy , Thanks for you important lesson. Just question if you don't mind, what do you mean by "K" do you mean that there is no kinetic energy or what ?
oh this video is great thanks a lot
Khan Academy is awesome, but these 2008 videos could use an update, aspect ratio change and pixelation increase.
Definitely
1 pascal = 1N/m^2
Why some videos like this one are so low quality?
What are the constants in the equations? Are they the constants in PV= K?
How is a pascal N/m3?
When he said the sun has higher energy than an ice cube, I burst out laughing 🤣🤣🤣🤣🤣
Unit of pressure -> N/m²
he was so serious about the Pa being N/m^3 that i started writing down F=ma and divided it by A.
the volume of the GAS increases thus makin it bounce more against the sides. (volume of box remains constant)
he actually explains in the next video that he got the unit wrong when he said N/m3
i waited for this for whole video( 10 minutes). lol
Fell out of my chair laughing. Thanks.
Pascals are N m^{-2} not N m ^{-3} by the way!
the Pascal is Newton per meter squared, not cubed!
force per area is pressure f is newton and a m^2 hence it should be n/m^2
Trying to finish my last piece of assignment and preparing for exam, hope it helps.
Ernest Wong Same here... Good luck
Where are you now ?
Pascal = Pa=N/m^2 force per unit area
Are you THE KHAN?
Sorry i have had some peanuts, let's continue.
*"Starts talking and explaining"*
Mind:
**Peanuts**
@minooo44 I haven't watched the video, but it's likely to be K - Kelvin. Same as Celsius but 273.15 degrees more.
wait so is k the same for the euqtion PV=k and T=k*KE/N
the sun has more energy than ice cube..hehehe funny comparison :)
thanks for the great vids sal..
keep it up
How's life now?
This is apart of chemistry as well as physics.
@joshuaguevara No man, look what he was doing at that time. He was trying to get an equation for K.E., so he started taking terms to the other side.
So, he had:
T = k . KE/N
So to get an equation for KE, you multiply both sides by N and divide both sides by k. That's why he had 1/k, because it had been taken to the other side of the equation.
IT IS MEASUREMENT OF VOLUME SO ITS ACTUALLY CUBIC METER N/m^3.
What about non ideal gases? This definition of temperature seems only appropriate when considering ideal gases. Not when talking about other gases or fluids. So im actually not satisfied with this characterisation of temperature, a good definition would be broader and would return to your definition in the limiting case of an ideal gas.
Goodness gracious, Sal! I am listening with headphones, and every time you cough right into the mic, it makes me jump! Please re-record!
one pascal is newton per meter squared not cube ..........timing = 1 min
Pascal is N/m². 🙏
Really?? you notice the Pascals but not the total F up on the calculations? the new pressure is not 1250!!!...... Wow Sal...... Wow....
1 Pa = 1 N/m^2 not cubed
PV=nRT
pressure is = N/m^2
7:10 "We said that, P•V is proportional to the kinetic energy of the system". When did we say that? I can't find it, I don't think you said it.
Ola Vikholt the previous video
ok got it
barrel of tea!!!
Sun has more energy than ice cube lol. Awesome comparison
you should check your proofs
did he forget to divide 5 by 2 on the initial side of the equation or was that on purpose?
''you'll have to excuse me i just had some peanuts...'' hhahaha, these videos r cool,
I love you
@xStarkiller91 it's 1250.
500 N/m2
lol I was eating peanuts when I was watching this video
@TheDarkWolf94 it's been established.....repeatedly.
yeah cause Pressure=Force/Area. So N/m^2.
YO! 1 pascal is equal to 1 Newton per square metre ... it's not cube meter.. it's surface area..
you should make a video on nuclear fusion. This is the next biggest step for the human race.
I'm using earphones so when he coughed it created SHARP sound that is terribly annoying. Don't eat peanuts again and NOT drink water afterwards, please. Or at least drink it during the video? I'm sure others wouldn't mind with, like, a twenty second pause.
Thought the same! LOL
I am confused that how PV is equal to a constant K times kinetic energy. I think you only said that PV is a constant.
Temperature itself is a measure of how much energy molecules have, the more energy they have, the more they vibrate. If they're vibrating then they're moving, hence the kinetic part.
DavidsonLoops I don't think he was asking that. What he's saying is first we start out with PV=K and then he says PV=K KE. Where did KE come from? I have the same question
Thank you!
LV07TSK thank you! it helps. one more question. The KE exists because of the movement of molecules, right? And the pressure and volume influence the speed of this movement. That is why this equation, PV=K*KE, works?
+Pengfei Zheng yeh
I just had some peanuts and I should have had some water with it..
I bet he knows Japanese based on how he drew that box at 9:05
I peed laughing
My college chemistry professor is pathetic. (It's evident by the fact that literally 30 out of 33 students are failing his class). You are my chemistry teacher from now on. =)
Actually, his answer is correct it is 1250 pa
LOLOL. Peanuts. Hahhaa :3 Your videos are great, keep them up!
Just to having it said: It's 32 F not 32° F.
Kosekans degree is used for Celsius and Fahrenheit but not for Kelvin.
212°F = 100°C = 373 K
Sir please can u defaine this theory
lol i just had some peanuts i should have had some water with it my throat is very dry.
@narcomanel Don't be flippant.
He said he had peanuts in his mouth ha ha
i heard that to this day he is still coughing and apologizing about peanuts
What the heck! it's N/m2 .It's not cube
it is on purpose
The video quality is so low...
me too hahaha
Tea of death
From 1/k*n*t to k*n*t?
Jose Pedro it doesnt matter...they are just constants
Why doesnt he divide 500 by 10 and afterwards divide 50 by 2?
it hurt my ears, too.. Lol!!
bike pump
Zajebte sem někdo úkoly od hrubé 😏
them peanuts were too dry
Salman u keep coughing into my ears, pls take a cough drop
I will forget tomorrow so I made me brain hurt for no reason
Well don't you thank Sal instead!
quit coughing in my ear!
please cough away from the mic, i gets to LOUD when you don't
no translation into Arabic!!!!
+محمد حشيش Learn English maybe.
+Aroused Squirrel I know English but translation helps me
Al habibi
You can volunteer to translate
it's ok if he wants.. why are u being so riddiculous bout it