pound-mass

English

Etymology

From pound +‎ mass, to differentiate from the unit of weight.

Noun

pound-mass (plural pounds-mass)

  1. A unit of mass equal to the weight, on earth (subject to standard gravity), of a mass of one avoirdupois pound, equal to about 453.592 grams. Symbol lbm or lbm.
    • 2000 October 9, Gérard P. Michon, “What is a slug, in the [engineering] weight measurement system?”, in Numericana.com‎[1]:
      On the moon, however the weight of a pound-mass (lb or lbm) is only about one sixth of a pound-force (lbf).
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