- A unit of temperature equal to 1/273.16 of the thermodynamic temperature of the triple point of water; the kelvin is the same size as the degree Celsius. The thermodynamic temperature scale (Kelvin scale) has absolute zero as its zero point.
- An organic compound containing a carbonyl group that is bonded to two other carbon atoms, R-C(=O)-R'.
- The SI unit for mass.
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