Graan (sümbol: gr) on väike massiühik Briti ja USA mõõtühikute süsteemis, mis on võrdne 64,798 91 milligrammiga (umbes 0,065 grammi). Üks gramm võrdub ligikaudu 15,43 graaniga. See on ainus massiühik, mis on veel kasutusel apteekrimõõtude süsteemis.
A grain (symbol: gr) is a tiny unit of mass in the imperial and US customary systems, defined as precisely 64,798 91 milligrams (about 0,065 grams). One gram equals about 15,43 grains. It is the only unit of mass shared across the avoirdupois, troy, and apothecaries' weight systems.
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