Kelvin

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Astrophysics

One Kelvin degree is equivalent to one Celsius degree. The difference between the two temperature scales: All motion within an atom ceases at zero Kelvin (K) -- this point is called absolute zero. Water freezes at zero degrees Celsius, which is approximately 273.16 K.

Lawrence Berkeley National Laboratory's Physics Division — Microwave Anisotropy Probe Glossary of Technical Terms retrieved 2014-05-20

an absolute, (not using negative numbers) unit of temperature. The coldest possible temperature of anything is 0 kelvin. This corresponds to -273 on the Celsius scale. There is no theoretical limit to how hot something can become.

Lawrence Berkeley National Laboratory's Physics Division — The Universe Adventure Glossary retrieved 2014-05-20