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i think quantum effects is temperature dependent, the question will be at which temperature do we expect quantum effects to become important. The classical theory fails at a certain temperature then quantum theorie should be used. Classical statistical mechanics tells us that the distance between particles in a gas under standard-conditions is of the order of 10∙10-9 m=10nm. In order to observe quantum mechanical effects in such a gas we have to reduce the temperature drastically. Zero K is the lowest possible temperature, since it corresponds to particle velocity of zero...

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