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US Customary System of Units (view source)
Revision as of 13:53, April 15, 2013
, 13:53, April 15, 2013→Weight: Some students of physics care about the distinction between mass and weight
One ''acre'' is 160 square ''rods''. 640 acres make a square mile.
One ''acre'' is 160 square ''rods''. 640 acres make a square mile.
== Weight ==
== Weight and mass ==
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:
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: