Friday, March 23, 2007

What's a "Grain"

Whenever you hear the term grain as in a measure of some herb or drug don't you wonder what the heck a grain is? The term originated from the unit of measure based historically on the average weight of a single grain of wheat. It was subsequently set to a more precise .0648 grams or .002285 ounces.

source . . . Thunderstruck by Erik Larson

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