When is it that molecules stop moving?

Answer 1

at absolute zero

Answer 2

In theory, molecules will stop moving at 0 on the Kelvin scale..."absolute zero"

Answer 3

In theory, molecules stop moving completely at Zero degrees Kelivin. (or -273 degrees C) However, scientists have been unable to reach "absolute zero" as it's called.

Answer 4

Theoretically at absolute zero, when there is no kinetic energy (the energy of both movement and heat).

However, I don't think absolute zero is practically achievable although they have gotten very close.

Perhaps, even then spontanous quantum events may cause the odd molecule to wobble now and then!

Answer 5

Don't think they do..even at zero K the HUP*
allows quantum fluctuations to momentarily 'donate' energy to particles..like in delta(E)*t=h/(2*pi)
* if you make an observation of a particle with a photon, this simultaneously changes the position of the particle. The greater the energy of the photon (or exploratory particle) the greater the deviation and uncertainty in position. So position and momentum, energy and time are exclusively complementary quantities whose product is h/(2*pi)
(You can work this out from the the DB relation lambda=h/p)

Answer 6

Absolute Zero (-273 Kelvin I think)

Answer 7

Theoretically at -273.15 degrees C, known as absolute zero. This temperature has not be reached by us

Answer 8

In ice the molecules are crystallized and therefore don't move.

Answer 9

when they have worked for 8 hours straight and need a rest.

Answer 10

absolute zero?