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.
Shawn Henning. Evaporation Definition: the process by which molecules undergo the a spontaneous transition from the liquid phase to the gas phase. Evaporation is the opposite of condensation. Example: The gradual drying of damp clothes is caused by the evaporation of water into water vapor. Return to the Chemistry Glossary Index.