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.
For example, on a hot summer's day if you sprinkle water on your skin it will cool your skin as you evaporate. That's an example of refrigeration! Water can't be used in freezer though, because it evaporates at too high a temperature. But some liquids evaporate at very low temperatures. For example Isobutane (becoming more common in domestic freezers) evaporates at very low temperatures.