The Fluid ounce reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Fluid ounce

A fluid ounce is a unit of volume in both the Imperial system of units and the U.S. customary units system. However, the two measures are not quite the same:

• The U.S. fluid ounce is (1/128) gallon, about 1.805 cubic inches or 29.573531 ml. This volume of water weighs about 1.04 ounces.
• The Imperial fluid ounce is (1/160) gallon or 8 fluid drams, about 1.734 cubic inches or 28.413063 ml. This volume of water weighs exactly 1 ounce under certain temperature and pressure conditions.

The UK fluid ounce is legally defined as 28.4130625 millilitres precisely in The Units of Measurement Regulations 1995
http://www.hmso.gov.uk/si/si1995/Uksi_19951804_en_2.htm

External link

Conversion Calculator for Units of VOLUME

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