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I thought to get classical mechanics you needed big particles, but Ehrenfest's theorem says lots of small particles would do.

- Thread starter geoduck
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- #1

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I thought to get classical mechanics you needed big particles, but Ehrenfest's theorem says lots of small particles would do.

- #2

bhobba

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All you are talking about is the law of large numbers in that the statistical average tends towards the average as the number increases. Each individual particle is still fully QM weird.

Thanks

Bill

- #3

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Ofcourse not, each is treated Quantum mechanically and will be so.

Finally under a statistical average, under many many measurements everything will tend obey the classical theory.

Bhobba please comment

- #4

bhobba

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Thanks

Bill

- #5

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exactly

- #6

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If you have a lot of particles, then their centre of mass will move nearly classically.

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