K

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.

ketone

An organic compound containing a carbonyl group that is bonded to two other carbon atoms, R-C(=O)-R'.

kilogram

The SI unit for mass.