The difference between Avoirdupois pound and Fotmal
When used as nouns, avoirdupois pound means a unit of weight in the avoirdupois system of weights, defined as 0.45359237 kg in most of the english-speaking world since 1959, whereas fotmal means an old english unit of weight of 70 pounds, used particularly for lead.
check bellow for the other definitions of Avoirdupois pound and Fotmal
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Avoirdupois pound as a noun:
A unit of weight in the avoirdupois system of weights, defined as 0.45359237 kg in most of the English-speaking world since 1959.
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Fotmal as a noun (obsolete):
An old English unit of weight of 70 pounds, used particularly for lead