Year in Review: Below absolute zero, but hot
Lab trickery achieves negative temperature
By Andrew Grant, 17:12 PM December 12, 2013
Ulrich Schneider must be a hit at cocktail parties. The physicist at Ludwig Maximilians University of Munich can tell awed guests that he is responsible for creating both the world’s hottest substance and lowest temperature — at the same time.
Schneider’s substance — a gas consisting of about 100,000 potassium atoms — reached a temperature below absolute zero, about –0.000000001 kelvins.
Unlike Fahrenheit and Celsius temperatures, where the zero point is arbitrary, absolute temperature (measu...
Source URL: https://www.sciencenews.org/article/year-review-below-absolute-zero-hot