Physics Glossary – K

Kepler’s Laws

  1. The planets move in ellipses around the sun.
  2. A line joining a planet/comet and the Sun sweeps out equal areas in equal intervals of time
  3. The squares of the periods of the planets are proportional to the cubes of the planets mean distance from the sun


A The SI unit of temperature, it is a the temp, it is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The triple point of water is the temperature at which water exits in all three states – solid, liquid and gas.


There are two charged Meson K and K+ and a neutral meson Ko in the K Meson family, these particles are collectively called kaons. They were the first particles to contain strange quarks.

Kuiper Belt

Is a disk-shaped region past the orbit of Neptune roughly 30 to 100 AU from the Sun containing many small icy bodies. The astronomer Gerard Kuiper suggested that it could be the source of the short-period comets.


Absorption of a K shell electron by a proton as it is converted to a neutron. Discovered by Hans Bethe and Luis Walter Alvarez.

Kirlian photography

Is where an object on a photographic plate is subjected to a high-voltage electric field, an image is created on the plate. The image looks like a colored halo or coronal discharge.1939, Discovered by accident in 1939 by Semyon Kirlian. Also called electrophotography.