Ultraviolet index. The ultraviolet index or UV Index is an international standard measurement of the strength of sunburn-producing ultraviolet (UV) radiation at a particular place and time. The scale was developed by Canadian scientists in 1992, then adopted and standardized by the UN's World Health Organization and World Meteorological Organization in 1994.
one-quarter-one of four equal parts; a quarter of a pound. fourth part, one-fourth, quarter, quartern, twenty-five percent, fourth. common fraction, simple fraction-the quotient of two integers.
For a list of Washington Quarter coins, see: Washington quarter. The reverse prior to the State Quarter Program. The current clad version is two layers of cupronickel, 75% copper and 25% nickel, on a core of pure copper. The total composition of the coin is 8.33% nickel, with the remainder copper. quarter, short for quarter dollar, is a U.S. coin worth 25 cents, one-fourth of a dollar. It has been produced since 1796. The choice of 1â4 as a denominationâas opposed to the 1â5 more common elsewhereâoriginated with the practice of dividing Spanish milled dollars into eight wedge-shaped segments.