about absolute zero

2007-11-06 11:21 pm

I've read something telling me that the volume of a matter is 0 cm³ at absolute zero.
From my knowlledge, I know that expansion and contraction is due to the change of distances between particles. That means the sizes of atoms remain constant when temperature changes. If the temperature is 0K, there are no spaces between atoms. while the sizes of atoms remain the same. Hence, why the volume of a matter is 0 cm³ at absolute zero?

回答 (1)

Sasabella

2007-11-10 9:32 pm

✔ 最佳答案

Because your source is not correct.

Absolute zero is the lowest possible temperature, but there is still energy there, which maintained the structure of the atom, and the energy 好似係 Planck's constant over frequency of the particle.

There are two types of matter, Fermion and Boson.

Normally matter is composed of fermions (proton, neutron, electron), which cannot occupy the same quantum state even at absolute zero. Therefore the volume is not 0 cm³.

Yet for bosons, (e.g. photons from light), they can occupy the same quantum state, and therefore their volume became 0 cm³.

參考: 自己

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