Who said....

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Originally Posted by mike_ie

No. By definition, absolute zero is the state at which there was no movement at the atomic level.



This is where it gets hinky, because in order to cool something to even lower than absolute zero, you have to change your definition of what absolute zero is. Absolute zero is also the state at which entropy reaches its minimum value, however the system being measured still possesses quantum mechanical zero-point energy, the energy of its base state. Negative absolute zero means, in laymans terms, playing around with that energy distribution to lower that energy which gives you a negative absolute zero value - something that has been achieved in labs just this week as it happens.

I'm not sure how you are trying to relate the speed of light to absolute zero though....

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Well it was more thinking how slow somthing could move and if somthing had no energy then it would not move would it?

And if somthing is at abosolute zero and so had no energy then how would
E=MC work?

In classical thermodynamics, absolute zero states that there is no movement at the atomic level. However this is not exactly true. It's not that the total energy of the system is zero (no movement), but rather that the system tends towards a constant energy - zero point energy - the lowest possible energy that a system may have. In other words, everything has some energy, even at absolute zero.

How does absolute zero affect light? Well, you can use absolute zero in a vacuum to create a form of matter that, when you pass light through it, it slows light down to about 38mph, if I recall correctly. It's been a few years since I've read up on it, so it could have been slowed down even further still.

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double post

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Originally Posted by Sparksdisco

and if you could cool it more than abosolute zero what would happen?

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Negative temperatures explained, but it's probably not what you expected.

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As a star loses energy, its temperature rises. Give a star energy, and you’re actually cooling it down.

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What the Dalai Lama can teach us about temperatures below absolute zero