Thermodynamics: Crash Course Physics #23
ฝัง
- เผยแพร่เมื่อ 14 ก.ย. 2016
- Have you ever heard of a perpetual motion machine? More to the point, have you ever heard of why perpetual motion machines are impossible? One of the reasons is because of the first law of thermodynamics! In this episode of Crash Course Physics, Shini talks to us about thermodynamics and entropy. Also, we learn about isovolumetric, isobaric, isothermal, and adiabatic processes. It'll all make sense in a minute!
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Put this video on 0.75 speed and you'll make your life easier xD
She sounds like a drunk lady talking about physics
The fact that i learned more in this channel than in school is weird
I can't believe how perfectly timed this is with my current physics class
i actually have a thermodynamics exam this weekend huhu
synchronicities
+Adam Raza Jung
Physics? I'm learning this in my college bio class XD
Well, not all of it :P
your "current" physics class huh? i see wat u did there
Physics is so interesting when you actually get to know and understand it, I really want to sue all my school teachers for not doing their jobs correctly and for only scraping the surface when it comes to Physics, it really is just so frustrating when you are so interesting in something that you can't even understand properly
I love everything about this video. I wish my expensive classes were as entertaining and as cleverly put together.
First law of thermodynamics: You don't talk about thermodynamics.
Second law of thermodynamics: You don't talk about thermodynamics.
Third law of thermodynamics: Who's new sweats.
First law of thermodynamics: You can't win.
Second law of thermodynamics: You can't tie.
Third law of thermodynamics: Eventually you lose.
Third law: you cant quit the game***
I've been doing thermodynamics in some way, shape or form for three years now and this has been by far the best presentation for these concepts that I've come across. Thanks Dr. Shini. Lecturers could literally spend two days explaining what she did in ten minutes in class. You guys are awesome.
Doing thermodynamics right now at uni! Perfect timing because i suck at it..
i had an exam on it a few months ago and only 14% passed xD
I know that feeling. Physical Chemistry 1 was all thermo. Lots of integrals and partial differentials. Good luck.
i bet you succeeded !
+
Wait, is thermodynamics supposed to be a uni class? I'm a highschool freshman and we have to take this class D:
This is so helpful! We've been doing thermodynamics as uni but I tend to sit in letcures with my eyes glazed over because I didn't fully understand the basics when we first learned them, so anything more complicated is too confusing.....
Loving the series. Thank you for all your hard work!
In love with this channel instantly! I don't even need to run it on 2x. She speaks so fast. Thank you.
this is honestly sooo helpful keep up the good work
I'm not one to comment often, but man I get so excited when I see these videos in my news feed. I can't get enough of them. And I'm an upcoming mechanical engineer too. Good work Dr. Somara.
I am distracted because of the fact that the bulbs are arranged to be exactly around her silhouette
Great observation
Omg lolll I didn't notice and now I keep getting distracted with the same thing 😂
Such a beautiful accent! I could spend all day listening to her xD
I love the way she arranged those lights around herself. Very Informative , thanks.
"In this house, we obey the laws of thermodynamics!"
Lovely explanation. Although if I was a student cramming for an exam, I would watch this video at 3/4 speed. You surely can talk fast Ms. Shini ( or Doctor Shini I would assume).
I love physics but my school's program sucks (I get 120 minutes a week), there is no extracurricular options to learn more physics and I can't afford private classes. I want to become an engieneer someday and your videos are keeping that dream alive, thank you!
What an knowledgeable attitude you have I love it it’s simply amazing
Thank you so much! You made a complex concept understandable for students like me. We will be having a physics exams tomorrow. Wish us luck!
Thx for this. .) I have exam next week, this is lifesaving. :) But exam is just "little" more complex but it whould start me up realy good. :) Love this channel.
Uou. I'm not good with Physics, but I think I understood about that topic. I'll watch again 😆
For everyone complaining like "She talks too fast I can't keep up..."
Read their channel name. Maybe, just maybe, it might explain why :)
The other videos aren't as fast and hard to keep up with. There is of course an effective way to give Crash Courses, and this series presenter doesn't demonstrate that unfortunately.
That’s nonsensical... maybe she could slow down! There are geniuses on this thread that can’t keep up so your point is moot!
@@angelwhalen7599 Geniuses could just rewatch or adjust the speed of the video...
@@angelwhalen7599 TH-cam provides an option where u can slow down the audio of the video
There exists an option to slow down the video...
Im so happy that for once i dint have to hear about the messy room analogy regarding entropy..
Thank you for this video! I am taking thermodynamics 2 right now and this is honestly a great review of all the basic thermo ideas!
Jenna Lippe Hi I m a great fan of ur videos
Jenna Lippe I need to know more about girls
Haha, think faster..or hit the pause button.
Dr. Shini Somara, very, very nice. I am now a fan.
I'm taking Aerothermodynamics right now. This definitely helped
Am I the only one that kept getting distracted by the bird in the lower-left corner?
I thought the distraction was the rest of the video
I'm distracted by her eyes.
The distraction to me was the beautiful woman talking..
I saw after reading your comment 😂😂
Mistergamer9892 what bird? Who should get medicated if something that 99.999% of people don’t even consciously notice is actually “distracting” to you lol
Other question- in the isobaric process example, it seems like the gas cooled when the piston was pushed down. I understand that in the equation, a temperature decrease would balance a decrease in the volume of the container. But, by what mechanism does this happen? I can't figure out *how* decreasing the volume would cause the gas to cool. It seems to me like if anything, doing that would actually cause the molecules to move even faster, although to an imperceptible amount. And after all, as she said, we're doing work on the system, so unless there's an exit for heat, wouldn't the internal energy increase? Would pushing the piston down not just raise the pressure of the gas in an inverse ratio to keep the left-hand side of the equation of equal value?
What i understood : There is a probability higher than 0 that the shattered cup may come back as a whole .. What this means is that time movin'forward is an illusion made by the probabilities and our short life span (universe wise)
Currently studying Bas Gas Turbines for my ATPL and this was such a great help
Her voice is absolutely gorgeous
Thanks, this video was really helpful, especially for last-minute revisions.
I'm in a fourth-year university class on geothermal energy. You are helping me save my butt!
This is a subject so few people understand. Glad this video exists. It explains much. I took physics, but, I watched just to bone up a bit and see if maybe I missed anything. Mostly, I just forgot a lot with, well, age atrophy....sigh...
In an hour I'm writting test in thermodynamics sooo... perfect timing CrashCourse :D
Lord bless the whole team of crash course. Thank you so much, understanding is key and you guys make it fun and understandable :((((((((( THANK YOU
Change the playback speed to 0.75 and turn on the subtitle.
Makes it easier to understand!
0.5 HAD TO DO.
The quickest I’ve been able to see a video after it gets uploaded!
2nd Law of Thermodynamics for Dummies: Warm things make cool things hotter.
Consequences: There ain't no such thing as a free lunch.
also disproves evolution
William Pereira Gomes If only there was some constant source of energy coming to the earth. I'd love to consider what source that could be, but I'd like to watch THE SUN set.
(Come to think of it...it more directly disproves the theory of the origin of beings by birth and development. After all, assorted molecules from digested food becoming part of a person that grows into another adult is a blatant reduction in entropy.)
@William Pereira Gomes: No it doesn't you idiotic pissant.
+William Pereira Gomes
Little darling, I feel that ice is slowly melting
Little darling, it seems like years since it's been clear
Here comes the sun, here comes the sun
And I say it's all right
Yeah because the earth is a closed system, right? It has no energy entering it apart from the sun's radiation--oh wait.
@7:12 this is the portion where others misunderstood the 2nd Law, glad that she pointed that out.
That explains why Homer Simpson's reliance on the drinking bird to keep pressing Y on the keyboard didn't work. There has to be a small amount of energy exchange at the beak to keep the bird bobbing.
Naise~ It summarized everything I have learned~ 😃
Y’all so goated
i
I once kept one of those birds going constantly for over a month! Just every 2 days or so I refilled the 'dunking' cup and it kept going 😂
In the end a build up of minerals on the beak of the bird basically prevented the beak actually coming into contact with the water :')
very thankuuuuuuuuuu mam for such outstanding explanation . will you please provide more videos related to thermodynamics . Anything else you want to suggest along with watching your videos for having and experiencing physics behind everything . again very thank you .
best course ever, i love the presentator
Nicely done! and guys, this is crash course so don't blame her for speaking fast :)
Crash course is very helpful to increase understanding speed
Adding graphics spiced up the things I'm so loving it it's better than physics class
YUS NEW COURSE!
explaining physics like a pro mashallah love u
"Dinner is coming" was such a cute reference inside that freezer. :)
Love this knowledge!
this might be the most inportend lesson if you want to understand the universe.
Which is more than you can say for spelling and grammar.
.....
+Brent Lewis typo Maybe?
Willy *Typos maybe?
I simply adore gorgeous physicists
this is love ♡
Does crash course still ever do history videos? I really liked those
I've noticed that at 2:09 its said that the heat lost by the system is equal to the work done by the system. Then at 6:02 that the work done by the system is equal to the heat added...
But its only the second which is true, right?
this channel has taught me more than my whole school life
Just like everyone else who says that. But I don't know, maybe you went to a shitty school, so I'll leave it at that.
No it doesn't. This channel only provides examples and details of what you already know. It clarifies, not teaches you new information. What is energy? What is work? What is heat? What is a system? You should learn all the info in this video in school, this is basic stuff. Unless you are 5 years old. r u 5?
@@BariumCobaltNitrog3n is he 8 now?
At constant pressure, 100J heat energy has been delivered to 8 gm of Oxygen. What is the change of internal energy? How much work has been done by the gas? (Moler heat capacity of Oxygen at constant pressure, Cp=29.1 J.mol-1.K-1. R=8.314 J.mol-1.K-1.) help plz
awesome editing !
It's likely just me, but for me, it feels like her lessons are concerned more about giving the 'law's and rules to remember rather than logic/common sense to describe it. Then again, I self-taught physics in high school and this is basically my first time getting lessons from someone else (in uni for physics now :) )
Nicely done!
You
are
awesome !
Love this channel
Great Video
such an amazing channel
I wonder why they used an equation for internal energy with the work portion subtracted. I've never seen it that way before myself. It's not a big deal since she immediately gives the disclaimer about some books having the opposite convention, I just wonder why anyone would even use the other sign convention since it seems to me to make much more logical sense to have positive work be work done on the system since that is more in line with the sign conventions for heat.
Absolutely genius perfect
Muy rapida la forma de presentar la informacion sirve para repaso de informacion pero para aprender no ,menos es mas, en mi caso repito el video para tratar de captarlo no se si otras personas harian lo mismo se agradece el video esto es una observacion
Thank you!
7:40 Yeah but so does every heartbeat and thought.
This was awesome
i love this teacher
Now come the best part of physic!!
So awesomesssss crashcource
this is the real teaching
thank you
Grrrrrrrrreeeeeeaaaaaaat great!!!!!!!!! Thank you so much 👍👍👍👍👌👌
thanks a lot!
8:36- U say that the 2nd Law of Thermodynamics (i.e. entropy of the Universe always increasing) is based on high probability. Does that mean that it is possible, however unlikely, that there will be instances where the entropy of the entire universe will actually DECREASE? After all, given an eternity, anything can happen.
The universe expands, also the universe before, we are come from out of a whitehole/blackhole is expanding. New expanding space means new place for energy and after the opened event horizon we are probably a tinier molecular universe inside a gigantic quark or something, what's mean more place for more energy.
thank you very so much
i was gonna watch this then i heard and saw you. gonna watch another video on this subject
Awesome videos!
U R Awesome thank you!
Amazing!!
Love u Doctor
How does heat transfer from hot to cool increase net entropy? I'll have to think about that a bit while listening to Muse's 2nd Law... both.
Hello Mam,
When I computed the work done in pool (billiard) the white mother ball break the 15ball. The work brought OUT is more than the work brought IN. Let’s try to compute.
F = 30lbs (White Mother Ball); D = 3ft (From the white mother ball to the first ball to strike)
SOLVE FOR ENERGY IN
W = F X D; W = 30lbs x 3ft = 90Ft.lbs ENERGY IN
SOLVE FOR ENERGY OUT
First two ball extreme corner of the billiard ball 2 out of 15 ball
W = F X D; W = 30lbs x 3ft = 90ft.lbs X 2ball = 180 ft. lbs
The remaining ball (13pcs ball) can produce more than 90 ft.lbs
The computation shows that the output work done is higher than the input work done
so the theory of conservation of energy is misconception.
Appreciated for your reply
Thank you.
Abel Urbina
Know what would help a lot with remembering all these sci-ency words? An understanding of etymology of Latin and Greek words of course! You could drop some of that knowledge in the Crash Course Lin-guist-ics course you should do! Pretty please.
have you done a video on the zeroth law?
Wait- around 2:15 she says that the First Law only describes Heat and Work, because if a system is closed, then those are the only two things, and they're equal to each other. Therefore, she says, the First Law is just restating the Conservation of Energy. But in that case, wouldn't deltaU just be 0, making the term unnecessary?
I understand the Law, but I'm not sure she explained that correctly. Or am I misunderstanding?
I hate when people say that entropy = disorder. ir gives a really wrong idea of how it works
energy always tries to spread equally everywhere, it has nothing to do with order or disorder. that means entropy is closer to equilibrium than disorder.
Equilibrium is orderly. Disorder is chaos.
Laff700 you could say that is the inverse. but how about crystals ? they are fruit of entropy. technically when they form they have less entropy than the space around it, but it is formed naturally when the gas or whatever try to go to a less energy state. so is it order or disorder ? the comparison doesn't make sense
***** I guess.
+Danilo “Dantiger” Oliveira
Crystallization is an exergonic process, so when crystals form, the entropy of the molecules forming the crystal decrease due to crystallization, but the entropy and thereby disorder of the overall system increases due to the released heat. Same reason why complex living organism can exists despite the 2nd law. Entropy indeed equals a state of lesser order, although 'equals a state of higher probability' fits the bill better.
I agree, entropy is a much easier concept when introduced by statistical mechanics as the logarithm of the multiplicity multiplied by boltzmann's constant
great vid
Came here so I could fully understand The 2nd Law songs by Muse
I listened to Unsustainable whilst studying thermodynamics. Singing it in your head during a test is quite effective.
Well, about that... I was let down by those songs because they got the science and reasoning wrong. The whole idea is summed up by this part: "In an isolated system, the entropy can only increase / A species set on endless growth is unsustainable". Well, first of all, in an isolated system *any* process doing non-zero work is unsustainable, endlessly growing or not. But more fundamentally, Earth is *not* an isolated system so the whole premise is wrong.
They just used the 2nd law as a way to point out the corruption of politics and the chaos they cause. "In an isolated system (corrupted country that refuses to open up), entropy (chaos and disruption) can only increase." Rather than the entropy itself.