Question

why the SI unit of pound is lb not pb?​

Answer 1

The international standard symbol for the pound as a unit of mass is lb. In the "engineering" systems (middle column), the weight of the mass unit (pound-mass) on Earth's surface is approximately equal to the force unit (pound-force). The SI is an "absolute" metric system with kilogram and meter as base units.no it is not pb.

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Answer 2

The unit is descended from the Roman libra (hence the abbreviation "lb"); the name pound is a Germanic adaptation of the Latin phrase libra pondo, 'apound weight