CT: condensation, in physics, change of a substance from the gaseous (vapor) to the liquid state (see states of matter). Condensation is the reverse of vaporization, or change from liquid to gas. It can be brought about by cooling, as in distillation, or by an increase in pressure resulting in a decrease in volume. Certain natural phenomena, such as dew, fog, mist, and clouds, are the result of the condensation of water vapor in the atmosphere; the formation of dew illustrates well the fundamental principles involved in such phenomena. The explanation of condensation can be found in the kinetic-molecular theory of gases. As heat is removed from a gas, the molecules of the gas move more slowly, and as a result, the intermolecular forces are strong enough to pull the molecules together to form droplets of liquid. Similarly, reducing the volume of the gas reduces the average distance between molecules and thus favors the intermolecular forces tending to pull them together.
S: http://www.infoplease.com/encyclopedia/science/condensation.html (last access: 22 February 2015)
N: 1. c.1600, “action of becoming more dense,” from Latin condensationem (nominative condensatio), noun of action from condensare (see condense). Meaning “conversion of a gas to a liquid” is from 1610s.
2. The physical process by which vapour passes into the liquid or solid form. It occurs either when air is cooled to its “dew-point” or when air becomes saturated by evaporation into it. Further cooling will cause the excess vapour in the air to be condensed on nuclei as minute water droplets or … into the solid form of “hoar-frost”.
S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=condensation&searchmode=none (last access: 22 February 2015). 2. TERMIUMPLUS.