Which of these temperatures is the coldest?
- 0° Kelvin:Absolute zero is the coldest temperature possible according to the laws of thermodynamics. Absolute zero, technically known as zero kelvins, equals -273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion. The temperature of a sample depends on how quickly the atoms or molecules in it are moving relative to each other. What we call ice is water molecules moving very slowly, in a matrix. Water molecules moving very quickly become steam. When molecules are near absolute zero, they cease moving altogether. Nothing can be colder than absolute zero.
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