A. Epstein And Sons
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 The ampere (, ; symbol: A), often shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units. is the unit of electric current in the International System of Units (SI). One ampere is equal to elect ... (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 affini ...
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