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What does ultracold mean?

Looking for the meaning or definition of the word ultracold? Here's what it means.

Adjective
  1. (physics) Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed.
  2. (informal) Extremely cold.
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Examples
What Maris has proposed is that loose electrons in ultracold liquid helium might split into fragments when exposed to light.
It's nifty to look into the chamber and see a clump of ultracold atoms floating there.
This false color image shows an ultracold plasma of 26,000 beryllium ions fluorescing when hit by a laser pulse.
In the ultracold environment where quantum effects dominate, however, information is held in a quantum bit or qubit for short.
In 2008 she collaborated with physicist Jun Ye to create the first ultracold gas made of polar molecules.
We naively thought that by ionizing the ultracold atoms in our trap, we would be running the CERN process in reverse.

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