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| Definition: The physical limit to how low a temperature any matter can have, which equals -273.15¡ C. While matter can be cooled to a small fraction above absolute zero, the third law of thermodynamics forbids reaching the limit. Kelvin is a unit for temperature in which 0¡ Kelvin = absolute Zero. One kelvin is defined as 1/273.16 (3.6609 x 10-3) of the thermodynamic temperature of the triple point of pure water (H2O). |
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