Simple question about E=MC^2

Gweedz

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25 Oct 2006 17:43:40 UTC

Topic 191986

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My understanding is that if E decreases, then M must decrease also.
So does that mean a chilled bottle of Merlot has less mass than the same bottle at room temp?

Joachim Schmidt

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Simple question about E=MC^2

25 Oct 2006 21:59:23 UTC

Message 48893

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Quote:

My understanding is that if E decreases, then M must decrease also.
So does that mean a chilled bottle of Merlot has less mass than the same bottle at room temp?

Yes, this is right. Althoug it is not much ...
If you decrease the temperature of 1 liter water by 10 Â°C, it's weight should decrease by about 10^-12 kg.

greets

Gweedz

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Thanks! I always wondered

26 Oct 2006 12:29:42 UTC

Message 48894

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Thanks! I always wondered about that.

At Absolute Zero, does E=0? Or is there still some energy that is not temp. dependent?

RenaudKener

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RE: Thanks! I always

26 Oct 2006 12:48:33 UTC

Message 48895 in response to message 48894

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Quote:

Thanks! I always wondered about that.

At Absolute Zero, does E=0? Or is there still some energy that is not temp. dependent?

1) The "mass at rest" of a body isn't equal to zero. Thus the energy isn't zero.

2) Near absolute zero there is still energy and you cannot reach EXACTLY absolute zero - because for particules to have exactly NO motion at all would violate Heisenberg's principle. You can go closer and closer to absolute zero, but it's an asymptote curve, you can't reach it exactly.

"Entia non sunt multiplicandam praeter necessitatem"
(OKHAM)