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US Customary System of Units (view source)
Revision as of 20:42, April 7, 2007
, 20:42, April 7, 2007→Weight
== Weight ==
== Weight ==
The US Customary system uses [[Avoirdupois]] weight. From the chief unit of weight, the [[pound (weight)|pound]], this system derives its units of ''liquid volume'' measure.
The US Customary system uses [[Avoirdupois]] weight. Effective July 1, 1959, the US Customary avoirdupois pound has been set equal to the international pound, and this in turn is based on a prototype pound in the British Exchequer.<ref name=pounddef>[http://www.sizes.com/units/pound_avoirdupois.htm Pound avoirdupois] at Sizes.com</ref> All other units of weight derive from this prototype. To be specific:
=== Pound (force) ===
One pound is either the mass of the international pound (or 0.45359237 [[kilogram]]), or more properly the force that gravity exerts on this mass on the ground on [[earth]].
=== Ounce (force) ===
One ounce is one sixteenth of a pound.
=== Ton ===
One ton is two thousand pounds.
== Mass ==
== Mass ==