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A pie chart showing the percentage by web browser visiting Wikimedia sites (April 2009 to 2012). In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100.
Being dimensionless, its unit is 1; it is expressed as a number, e.g., 0.18. It is the same concept as volume percent (vol%) except that the latter is expressed with a denominator of 100, e.g., 18%. The volume fraction coincides with the volume concentration in ideal solutions where the volumes of the constituents are additive (the volume of ...
The above equations (1, 2) run at a rate of 8.8×10 −9 and 4.4×10 −13, respectively. These calculations assumed the given rate constants and abundances of [ NH 3 ]/[ H 2 ] = 10 −5 , [ [H 3 ] + ]/[ H 2 ] = 2×10 −5 , [ HCO + ]/[ H 2 ] = 2×10 −9 , and total densities of n = 10 5 , typical of cold, dense, molecular clouds. [ 185 ]