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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.

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.

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