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US Customary System of Units (view source)
Revision as of 20:32, April 7, 2007
, 20:32, April 7, 2007→Weight: Add mass section and define a slug
== 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. From the chief unit of weight, the [[pound (weight)|pound]], this system derives its units of ''liquid volume'' measure.
== Mass ==
In recognition that weight, being a force, is not an acceptable substitute for the measure of mass, physicists have added a mass unit to the US Customary system: the ''slug''.
=== Slug (mass) ===
One slug is that mass which, when subjected to a force equivalent to a one-pound weight, will accelerate by one foot per second per second. Thus a pound is that force required to accelerate one slug of matter one foot per second per second. A slug would weigh thirty-two pounds on the ground, because the acceleration due to gravity at ground level on [[earth]] is thirty-two feet per second per second.
== Liquid Volume ==
== Liquid Volume ==