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.
As the water absorbs heat from the air, the air temperature decreases and is returned to the room. Evaporative cooling is also used to cool nuclear power plants. The heat from the nuclear core flows into water cooling systems. The water absorbs the heat and is released as steam from the power plant.