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Researchers in the US have done what Albert Einstein thought was impossible – measure the instantaneous velocity of a particle undergoing Brownian motion. The measurements, performed on micron-sized suspended glass beads, prove directly that a Brownian particle's kinetic energy is independent of its size, as is the case with atoms and molecules, and suggest a way of studying the quantum properties of macroscopic particles.

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"That's a confirmation of the classical high temperature equipartition theorem used by Einstein that in thermal equilibrium the mean kinetic energy of the center of mass of a particle is (3/2)kBT, where kB is Boltzmann's constant of Entropy and T is the absolute Kelvin scale temperature. This breaks down however at the quantum level and also I guess when the system is pumped way off thermal equilibrium." Jack Sarfatti