Absolute Zero - Dream Achieved

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Autor:	worldswonders
Opis:	Although it is not possible to cool any substance to 0 K (or −273.16°C), in June 5th 1995, two scientists achieved temperatures very close to absolute zero, where matter exhibits (i) the Bose-Einstein condensation phenomenon (only exists at temperatures lower than a few billionths of a degree above absolute zero) and (ii) the quantum effects such as superconductivity and superfluidity. Absolute zero is the theoretical temperature limit at which entropy would reach its minimum value. The laws of thermodynamics state that absolute zero cannot be reached, because this would require a thermodynamic system to be fully removed from the rest of the universe. A system at absolute zero would still possess quantum mechanical zero-point energy. While molecular motion would not cease entirely at absolute zero, the system would not have enough energy for transference to other systems. It is therefore correct to say that molecular kinetic energy is minimal at absolute zero.
Wyświetlenia:	35,959

Tagi: Absolute Zero superconductivity superfluidity Bose-Einstein condensation quantum physics

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