What is Fluid ounce?
A '''fluid ounce''' is a unit of [[volume]] in both the [[Imperial unit|imperial system of units]] and the [[U.S. customary units]] system. However, the two measures are not quite the same: * The Imperial fluid ounce is (1/160) of an imperial [[gallon]] or 8 [[fluidram|fluid drams]], about 1.734 [[cubic inch]]es or exactly 28.413 07425 ml (as specified legally in [http://www.hmso.gov.uk/si/si1995/Uksi_19951804_en_2.htm ''The Units of Measurement Regulations 1995'']). This volume of [[water]] weighs very nearly 1 avoirdupois [[ounce]]. * The U.S. fluid ounce is (1/128) of a U.S. fluid gallon, about 1.805 cubic inches or exactly 29.573 529 562 5 ml. This volume of water weighs about 1.04 [[avoirdupois]] ounces. * U.S. law 21CFR101.9(b)(5)(viii) also defines a fluid ounce of exactly 30 ml, for use in nutrition labeling. == Other websites == *[http://www.ex.ac.uk/trol/scol/ccvol.htm Volume Conversion Calculator] {{Webarchive|url=https://web.archive.org/web/20041027090207/http://www.ex.ac.uk/trol/scol/ccvol.htm |date=2004-10-27 }} [[Category:Imperial units]] [[Category:Units of volume]] {{stub}}