- #1
Happiness
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Is entropy real? It seems like it's not real because it depends on how you group microstates together into a macrostate, and the way you group them can be arbitrary. For example (at 13:04 of the video below), there are 91,520 microstates in the macrostate “9 in left; 1 in right” but 627,264 microstates in the macrostate ‘5 in left; 5 in right”, meaning there are way much more microstates in the latter than in the former, so the latter macrostate is more probable. But the naming of "left" and "right" is in a sense “arbitrary” because I can always rename or regroup which atoms/positions I shall now consider as left and which as right, artificially. So my question is, if I can arbitrarily rename or regroup how I define my macrostates, then is entropy real?
My question is in relation to this YouTube video "The Most Misunderstood Concept in Physics" by Veritasium: www.youtube.com/watch?v=DxL2HoqLbyA
But in any case, you don't really need to watch the video to understand my question.
My second question is does time stop to exist in the future, suppose the ultimate fate of the universe is a heat death?
24:29 of the video: “In the distant future, after the last black hole has evaporated, the universe will be in its most probable state. Now, even on large scales, you would not be able to tell the difference between time moving forwards or backwards, and the arrow of time itself would disappear.”
It seems rather weird to me that time would stop existing in future (or stop existing in any meaningful way). So I think it would be the case that the universe can never achieve heat death completely; it will always get closer and closer to it but will never reach it, so time will never cease to exist, because that state is never reached. Anyway, I may be wrong. So please correct me if I am wrong.
Another related question would be, since time has a beginning (which is the start of the Big Bang), then does that mean time must have an end?
My question is in relation to this YouTube video "The Most Misunderstood Concept in Physics" by Veritasium: www.youtube.com/watch?v=DxL2HoqLbyA
But in any case, you don't really need to watch the video to understand my question.
My second question is does time stop to exist in the future, suppose the ultimate fate of the universe is a heat death?
24:29 of the video: “In the distant future, after the last black hole has evaporated, the universe will be in its most probable state. Now, even on large scales, you would not be able to tell the difference between time moving forwards or backwards, and the arrow of time itself would disappear.”
It seems rather weird to me that time would stop existing in future (or stop existing in any meaningful way). So I think it would be the case that the universe can never achieve heat death completely; it will always get closer and closer to it but will never reach it, so time will never cease to exist, because that state is never reached. Anyway, I may be wrong. So please correct me if I am wrong.
Another related question would be, since time has a beginning (which is the start of the Big Bang), then does that mean time must have an end?
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