- A unit of mass equal to exactly 453.59237 grams. Also called pound mass.
- A unit of mass equal to approximately 373.242 grams. Used in certain contexts, such as the indication of mass of precious metals or stones.
- A unit of weight or force equal to the force of gravity on one pound (1). This value varies by location, and is equal to approximately 4.44822 newtons. Also abbreviated lbf, which is more proper than lb. Also called pound force.
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