Question: What happens at absolute zero?

Chris Armstrong answered on 15 Jun 2015:

By definition, in a classical system there would be zero particle motion, heat/temperature can be thought of as the energy of the particles at absolute zero there would be no energy and so absolutely no motion. Even in solids particles are constantly in motion vibrating within their lattice structure.

We can get very close, and I’m led to believe that we have surpassed it (created negative kelvin, which can be considered infinitely hot rather than colder than absolute zero), when we get very close however things start becoming interesting.

My bachelor dissertation was based around Bose-Einstein Condensates which occur only within the nano-kelvin range. Within a BEC the particles all begin to occupy the lowest energy state, when that happens we begin to see quantum effects materializing on a macroscopic scale. Scientists have grand hopes for this intending to use them to stabilize quantum computing.