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Define temperature. temperature synonyms, temperature pronunciation, temperature translation, English dictionary definition of temperature. n. 1. a. The degree of hotness or coldness of a body or environment. b. A measure of the average kinetic energy of the particles in a sample of matter,...
âºâº Definition: Kelvin. The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvins is absolute zero (when molecular motion stops), and one kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.