A. Donald Gray
A is the first letter of the Latin and English alphabet. A may also refer to: Science and technology Quantities and units * ''a'', a measure for the attraction between particles in the Van der Waals equation * ''A'' value, a measure of substituent effects on the stereochemistry of cyclohexane * absorbance (''A'') * acceleration (''a'') * activity (chemistry) (''a'') * adsorption (a) * annum (a), for year * are (a), a unit of area (equal to 100 square metres; redirects to ''hectare'') * atto- (a-), the SI prefix meaning 10−18 * Ampere (A), unit of electric current * ångström (Å) a unit of length (equal to 1 metres) * area (''A'') * attenuation coefficient (''a'') * Bohr radius (''a''0) * chemical affinity (''A'') * gain (electronics) In electronics, gain is a measure of the ability of a two-port electrical network, circuit (often an amplifier) to increase the Electric power, power or amplitude of a Signal (electrical engineering), signal from the input t ...
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