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Fluid Ounce

Course: 
3rd Grade

A unit of a liquid capacity.

Meaning

Abbreviated oz, a conventional (English) unit of volume equal to two tablespoons, or an eighth of a cup. (The word ounce is, somewhat confusingly, also used as a measure of weight.)

From... To... Ounces Cups
1 Tablespoon 1/2 oz (1/2 ounce) 23 20
1 cup 8 oz (8 ounces) 23 20
1 pint 2c (2 cups) 24 21
1 quart 4c (2 pints) 25 22
1 half gallon 8c (2 quarts) 26 23
1 gallon 16c (2 half gallons) 27 24

For more detail, see "Fluid ounce" on Rowland's Dictionary of Units of Measurement.

Mathematical background

This English conventional system of measure is entirely based on doubling.