MovieChat Forums > Wonders of the Universe (2011) Discussion > Question about entropy (first episode)

Question about entropy (first episode)


The first episode discusses entropy, which means things always go from order to disorder and thus creating a sense of time. I've only seen the first episode so maybe it gets explained in the other ones but i was wondering if order is the default state then how did it arise?

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The first episode discusses entropy, which means things always go from order to disorder and thus creating a sense of time. I've only seen the first episode so maybe it gets explained in the other ones but i was wondering if order is the default state then how did it arise?


If we decide that a given initial arrangement of particles is order, what follows is no change or disorder. Entropy of an isolated system always increases or remains constant. To answer your question: Whatever "default state" you pick arises from disorder of some previous order. I think we are just playing with concepts here.

In the documentary it was explained that if a structure has a low entropy (there is less possible variations in the arrangement of its particles), then such structure is less likely spontaneously occur. Pretty much common sense.

What is said about time is just that changes happening in and around you create a sense of time. You experiece something is happening vs. everything stays the same. The essence of time itself is not understood.

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Each episode is centered around a specific subject, namely: Time, Elements, Gravity, and Light. I don't recall him returning to the subject of entropy in later episodes - they have their own equally "big" subjects to cover!

As the episode says, entropy is the inevitable and observable progression of things from a more ordered state to a less ordered state.

However, that statement does not imply that everything begins in some "perfect" state of total order. It merely states that disorder progressively increases - and the rate of progression of that disorder is one way we have of defining, observing, and measuring the passage of the effect that we call "time."

It would be more accurate to say that everything starts out with a certain degree of disorder, and the level of that disorder increases over time.

You should probably proceed to the second episode, which deals with the elements - the building blocks from which everything is constructed. In that episode it becomes clear that everything, whether a rock or a human being, is formed from elements which are drawn from all across the universe. As the episode's (somewhat overly-poetic) title implies, we are all us - in a very real sense - "stardust."

Everything in the universe is formed from these elements - disparate building blocks coming together to form a "thing" - so everything must, by its nature, contain an inherent degree of disorder. What we call "order" is merely the state of those elements holding together in a coherent form, temporarily - until entropy breaks down that coherence, and the thing inevitably reverts to its constituent elements. Elements which will, equally inevitably, then become part of something else.

"Dust to dust" - to quote a well-known meditation on the cyclic nature of this process.

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Basically, it means that if you fart in the corner, it doesn't stay there.

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