Researchers achieve temperatures colder than absolute zero

When heated atoms can move with different levels of energy, from low to high. With positive temperatures (blue), atoms more likely occupy low-energy states than high-energy states, while the opposite is true for negative temperatures (red).

The coldest temperature possible is most often thought to be absolute zero.  Researchers have now shown they can achieve even lower temperatures for a strange realm of “negative temperatures.”

 

 

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