**Full name:** kelvin

**Plural form:** kelvins

**Symbol:** K

**Alternate spelling:** degree kelvin

**Category type:** temperature

**Scale factor:** 1

The SI base unit for temperature is the kelvin.

Valid units must be of the **temperature** type.

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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. The Celsius temperature scale is now defined in terms of the kelvin, with 0 °C corresponding to 273.15 kelvins, approximately the melting point of water under ordinary conditions.

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