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- kelvin. (K)
- The SI base unit of temperature, defined by assigning 273.16 K to the temperature at which steam, ice, and water are at equilibrium (called the triple point of water). The freezing point of water is 273.15 K.
- ketone. (R-CO-R')
- An organic compound that contains a carbonyl group. For example, methyl ethyl ketone is CH3COCH2CH3_ is used in some adhesives.
- kilo-. (k)
- Prefix used in the SI system meaning "one thousand of". For example 1 km means "one thousand meters"; 2.8 kg could also be written "2.8 × 103 g" or "2800 g".
- kilogram. (kg)
- The kilogram (kg) is the base unit of mass in the SI system of units. The standard kilogram is a 1 kg corrosion resistant platinum/iridium cylinder, carefully preserved in the suburbs of Paris (with a backup copy kept in Gaithersburg, Maryland.) Efforts are underway to replace these artifacts by redefining the kilogram as the mass of a certain number of silicon atoms.
- kinetic energy. Compare with potential energy.
- The energy an object possesses by virtue of its motion. An object of mass m moving at velocity v has a kinetic energy of ½mv2.
- Kw. Kw.
- Symbol for the autoprotolysis constant for water, equal to 1.01 × 10-14 at 25°C.