Sixty Symbols - 2017-01-17
Professor Mike Merrifield discusses aspects of the Second Law of Thermodynamics. Referencing the work of Kelvin and Clausius, among others! Professor Merrifield is the Head of the School of Physics and Astronomy at the University of Nottingham. Gamma Trilogy: https://www.youtube.com/playlist?list=PLcUY9vudNKBNwkTA_1VWz8JeqO8HU15qo Patreon: https://www.patreon.com/sixtysymbols Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/sixtysymbols This project features scientists from The University of Nottingham http://bit.ly/NottsPhysics Patreon: https://www.patreon.com/sixtysymbols Sixty Symbols videos by Brady Haran http://www.bradyharanblog.com Email list: http://eepurl.com/YdjL9
First law of Thermodynamics: Don't talk about thermodynamics.
Ocean Bagel lol
Ocean Bagel Bravo
bravo
Only applies if you're not an engineer
Four perpetual motion enthusiasts disliked this.
+Sigurjon Myrdal
You do realize those are the same concepts applied in different ways, right?
The second law of thermodynamics has to do with entropy or unavailable energy. The conservation of energy law or the first law of thermodynamics prohibit perpetual engines. Not the same. Look it up.
Bose-Einstein ii
no they violate the standard model AND string theory because "perpetual engines" do not use language or mechanisms that are governed by mathematically predictable interactions between radiant energy (or whatever you prefer it to be) and the observable dimensions
Perpetual motion?
Oh, you mean like the earth? North and South poles and won't stop moving?
Zeroth Law of Thermodynamics was invented by Captain Obvious.
But you can't compare relationships and chemical reactions with heat flow. The zeroth law basically implies that if A = B, and B = C, then A = C. This is far too fundamental a notion to be applied to more complex systems where other factors play a role.
In basic physics most simple measurable quantities are indeed transitive. Outside of physics, the most common example of being non transitive is probably the game rock-paper-scissors in which no object is the best and the property of beating or being beaten is not carried across. This is something of a cheat because we arbitrarily made up the rules anyway. A better example is Penny's Game (look for it on Wikipedia), which is a genuine purely mathematical observation about probability.
In fact non transitive things are usually quite complex ideas or, as with speed, disappear when we suitably constrain another variable.
yup. The same thing was said when apples fell from the sky. "But its obvious that they would would fall!" - and thus no one discovered the principles of gravity for thousands of years. Captain obvious is not a scientist.
I don't see how is it an obvious law. Two objects are in thermal equilibrium, if there's no thermal flux between them. And how is thermal energy being transfered? By particles of one body bumbing more violently into particles of the other body; and this is happening at their point of contact. The zeroth law is telling us, that there aren't any other factors in play. For example geometry and topology of the contact, different materials - that with all these variables changing, the equilibrium is the same. This property of matter is what allows us to define the concept of temperature.
Sometimes the more fundamental truths you aren't even aware of yet like somewhere in the "obvious" or in conjunction with it... You should never take things for granted or assume there's nothing else there ;)
My favorite statement of the laws of thermodynamics:
1: You can't win.
2: You can't break even, except on a very cold day.
3: It never gets that cold.
0: You can't quit the game.
+Jason Bone aww thanks so much! I'm glad you enjoyed them :) thanks so much I definitely will!
There should be a Nobel prize for comments like this.
+Redwave trance Fu guy, I hadn't lost in months.
I hadn't lost in years, is the game still on? Who is winning?
fede not me. The game. And not you. :P
This is the best description of the 4 laws of Thermodynamics I have ever heard
4?
If u count the "0th" law, there r 4 alltogether.
Yeah, the proof of the equivalence of Kelvin's and Clausius's versions of the Second Law is so clear, much better than you usually find in the textbooks.
Saeed Baig 4 law? can u tell what law sepertatly describe with few words?
Really?
I actually think that the way the 2nd law explained in this video is kinda confusing.
Basically it's saying in a closed system, "work in > work out"...
At 3:10, when Prof M. says "if you're prepared to inject some energy, you can make hot things colder and cold things hotter", I'm sure he really meant to say "... hot things hotter and cold things colder".
Mark Holm Too late now. Conspiratards will just twist whatever is done to prove their point! (which is conveniently located at the top of their head btw) People born in Ignoramustan learn from childhood that even slips of the tongue can be convoluted into virtually any moronic claim.
@Charlie Franz Well, Ron Burgundy could probably think of something to say about that.
That statement is still true for the 'cold things hotter part'.
Actually, there are no mistakes in the first statement at all, physically talking, of course.
Yes, a new video should be done.
Murphy's Law of Thermodynamics: Things get worse under pressure
This law is clearly the most important thing in the universe since this is the one reason time can not flow backwards.
I like the nail and gear there.
The Guy That makes you mad yup :)
I liked the stirling engine
I noticed that and looked up to find it's the flag for Hello Internet podcast. Why is it popular though? Is there a backstory?
@Shailendra Paliwal the guy who does Numberphile is one of the hosts of Hello Internet, and he's very proud of the flag referendum they ran for it.
0th law: There's a game
1st law: You cannot win
2nd law: You cannot really tie either
3rd law: You have to keep playing
The Guy That makes you mad I learned this as, "you have to play the game (first law), you can't win (second law), you can tie at absolute zero (third law), but you can't reach absolute zero." Not sure what the last bit was from, there is always some quantum tunneling which involves some motion and thus some heat or something Physical chemistry is where you learn to like synthesis because math gives you a headache.
Sometimes explaining the obvious makes it confusing and not so obvious.
Mind blown!
Nice nail and gear engine
in my uni they say: the third law of thermodynamics is that you will write the thermodynamics exam at least twice
Does the third law of thermodynamics mean if I keep the kitchen at absolute zero, I'll never have to tidy it up?
Thanx, Its an image of foxkeh, a japanese mascot for firefox events. I chose the cute friendly image to show my own friendly nature that sometimes gets obscured behind my rather intense deliberate qualities. Sort of takes the edge off. :-) As for you image, there must be s story there. Looks like a friendly basset hound with glowey eyes. :-). I guess he is "all-seeing" but more likely "all-smelling" but glowey nostrils would not have as much appeal. :-)
It also means that if the kitchen isn't at absolute zero, then you failed at tidying it up.
@martin Cereals contain starch and starch is sticky.
@retepaskab
Thank you retepaskab ))
Actually, you should NEVER tidy up anything! You will decrease local entropy but at the cost of increasing total entropy of the universe, hence you will accelerate the heat death of our universe ever so slightly.
I also like how the first example just turned the whole box into a perpetual motion machine.
I thought the First Law of Thermodynamics was, "Don't talk about Thermodynamics?"
lol this is great.
Every time I get drunk I bring up how funny fridges are; that you add energy to make things colder.
When the 2nd Law comes up I always think of Muse (:
Law And Disorder: Special Temperature Units
I actually have a Thermodynamics exam the day after tomorrow, this a good way to go over my notes again!
What are the chances? ...
lol, thank you Brady i actually needed that
This was a really great video Brady! I'm glad I watched it. Hope you have a fantastic day. : )
when he involved magic fridge I got confused
What interests me the most is actually how Clausius came up with the second law. There were two rival theories of heat, matter and kinetic. Clausius believed in the kinetic theory but he also believed in Carnot's principle, which was proven using matter theory and the 1st law. Clausius tried to incorporate kinetic theory and Carnot's principle but found it's impossible to prove Carnot's principle using the kinetic theory of heat and the 1st law. But it's possible to do so if the later called 2nd law is added. That's how he proposed the 2nd law, not by actually proving it.
the second law of thermodynamics is that you never talk about thermodynamics
I love how you count in binary in the truth table :)
That was really interesting.
Thanks!
Nice! Please make a video on the laws of thermodynamics in relation to quantum mechanics, entanglement and negative enthropy.
That was really cool! I did not expect this law equivalence ^^
That was an amazing explanation!
The 2nd Law, nice album<3
Amazing explanations guys, it's amazing how you guys helped me during me aerospace engineering degreee many thanks!
Could you do an update video on one of your side channels with Prof. Moriarty?
Well said, but I was hoping to hear about entropy.
I WANT THAT STIRLING ENGINE
solid upload
This is amazing.
Hello Internet!
Finally, the law's true essence!!!!!!!!! The disorder is breaking my system.
Very interesting way to prove something.
I always think about the zeroeth law whenever I use a thermometer. At least, one that isn't infrared. Don't think it applies to IR thermometers.
Cool video, love this channel!
Simply Brilliant!!!! I love it when you guys write out the equations and stuff.
Equations? What Equations?
you seriously didn't watch the video... 5:57
in plain sight W=q2-q1
I see what you did there. Using the HI logo with the gear and nail for your engine. ;)
I thought it was a nice touch.
more please! =)
4 views
excellent demonstration of logical deduction & a great explanation of one of the golden laws! TY
Great explanation,amazed!
hah, the hello internet emblem. nice one Brady
StevenToast - 2017-01-17
"In this house we obey the laws of THERMODYNAMICS!"
Bob White - 2017-06-25
I saw what you did there!
Nothing\ - 2019-11-25
It just keeps going faster and faster.
You know, I just realized that probably explains why the Simpsons are able to afford multiple mortgages on such a large, 4 bedroom house with 3 living areas (rec room, living room and the mysterious rumpus room), 2 cars and who knows how many whacky adventures, despite only Homer working in the house and according to the bear tax episode, he only makes 3 figures on his paychecks. Lisa must have solved the energy crisis.
Pink Pyramids - 2020-03-14
But dad, Kevin’s mom lets him make perpetual motion machines all the time! This is so unfair! I hate you!