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Entropy: A little understood concept in physics [video]

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Re: Entropy: A little understood concept in physics [video]

#11
A pithier way to introduce this topic: the first law of thermodynamics, a.k.a. the law of conservation of energy, is that energy cannot be created nor destroyed, only transformed from one form to another. In light of this, how can there ever be a shortage of energy?

[Note that this is intended to be a rhetorical question advanced for the purposes of pedagogy. If you find yourself wanting to post an answer, you have missed the point.]

Re: Entropy: A little understood concept in physics [video]

#12

That's an excellent overall summary as he covers almost every aspect of the subject albeit in brief. It would be good if he produced a second video dealing with the low entropy of incoming energy from the sun and the higher entropy of radiated energy from earth and relate that to global warming. In all the debate over global warming little is talked about why say CO2 and other greenhouse gasses increase the earth's t…

Which debate over global warming are you referring to? There are debates that involve atmospheric chemists that discuss Earth darkening cause and effects. https://en.m.wikipedia.org/wiki/Albedo

Right, the average person hasn't a clue about albedo, nor do they know why say CO2 and CH4 increase global warming whereas others such as O2 are more benign.

It may help lower the temperature of the debate if they did.

Edit, we're pitching this discussion at the level he has—the lay public. Scientific argument over the minutiae is another matter altogether.

Re: Entropy: A little understood concept in physics [video]

#13
post #11

A pithier way to introduce this topic: the first law of thermodynamics, a.k.a. the law of conservation of energy, is that energy cannot be created nor destroyed, only transformed from one form to another. In light of this, how can there ever be a shortage of energy? [Note that this is intended to be a rhetorical question advanced for the purposes of pedagogy. If you find yourself wanting to post an answer, you have m…

Usable energy is different than total energy. If energy isn’t concentrated (say something like gasoline) it’s not usable

Re: Entropy: A little understood concept in physics [video]

#14
post #2

I hate Veritasium's clickbait, and I think most of his videos are very poor, but this one is the exception. It's very well put together. The first ten minutes of the video is exactly how I introduce entropy to people. Of course I can't give him a pass on how crass it was telling that women he has a PhD in physics (he does not). The video would have been so much better without that two seconds of footage...

Most of his videos are GOOD, come on!

Re: Entropy: A little understood concept in physics [video]

#16
post #2

I hate Veritasium's clickbait, and I think most of his videos are very poor, but this one is the exception. It's very well put together. The first ten minutes of the video is exactly how I introduce entropy to people. Of course I can't give him a pass on how crass it was telling that women he has a PhD in physics (he does not). The video would have been so much better without that two seconds of footage...

"I think most of his videos are very poor," Why do you think so? (Most to me seem reasonable but one on speed of electricity stands out as badly done (he redid the video but it too could have been better).)

His dandruff ad was pretty cringe IMO. But idk, it seems like his videos are really long for what they accomplish in general. He seems like the generic youtuber that milks every dollar of ad revenue and is shameless about it.

Kind of sad that a expensive camera + clickbait thumbnail/title > Experts communicating clearly and accurately.

I imagine he/his team is scouring youtube for the experts, and remaking their videos with more production value.

Re: Entropy: A little understood concept in physics [video]

#18
post #11

A pithier way to introduce this topic: the first law of thermodynamics, a.k.a. the law of conservation of energy, is that energy cannot be created nor destroyed, only transformed from one form to another. In light of this, how can there ever be a shortage of energy? [Note that this is intended to be a rhetorical question advanced for the purposes of pedagogy. If you find yourself wanting to post an answer, you have m…

> how can there ever be a shortage of energy

I think it's not so much a shortage of energy, but that there thermodynamic equilibrium and thus no available energy to do anything.

I don't think this will ever happen tho, it's pretty clear to me that making energy more dense is a universal process.

Re: Entropy: A little understood concept in physics [video]

#19
I recently enjoyed this presentation by Sean Carroll that touches on definitional and philosophical issues with entropy. The talk made me feel less stupid for not feeling entirely comfortable with how entropy was explained to me before. Turns out there are a few different ways to define and quantify entropy that are used in different contexts and they each have some unresolved philosophical issues.

"Can you get time out of Quantum Mechanics?": https://youtu.be/nqQrGk7Vzd4

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