Glossary - Jj Kk
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Joule | (J) The SI unit of energy, equal to the work required to move a 1 kg mass against an opposing force of 1 newton. 1 J = 1 kg m2 s-2 = 4.184 calories. |
| 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 | 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. |
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