Medical Definition of Puberty, precocious. Puberty, precocious: Precocious puberty is the unusually early development of secondary sexual features. The onset of sexual maturation in a girl before age 8 or a boy before age 9 is usually considered to be precocious puberty. Last Editorial Review: 7/1/2016.
Evaporative coolers lower the temperature of air using the principle of evaporative cooling, unlike typical air conditioning systems which use vapor-compression refrigeration or absorption refrigerator. Evaporative cooling is the addition of water vapor into air, which causes a lowering of the temperature of the air.
Evaporation is the phase change of a liquid to the gas state. Evaporation is one of the two types of vaporization. The other form of vaporization is boiling. Evaporation occurs only on the surface of the liquid. When the energy of such a surface liquid molecule is increased due to any internal or external factor, the molecule will be able to break the intermolecular bonds acting on it, thus creating a gas molecule. This process can occur is any temperature.