Depending on which meaning you want, an ounce is a unit of measurement used for measuring either small amounts of mass or small amounts of volume. The ounce as used for measuring mass is abbreviated 'oz' and there are 16 oz to a pound, so 4 oz is 1/4 of a pound. However, if you are measuring volume, the ounce is referred to as the 'fluid ounce' (abbreviated 'fl. oz'). There are 8 fl. oz to a cup, 16 fl. oz to a pint, 32 fl. oz to a quart, and 128 fl. oz to a gallon. Thus, 4 fl. oz is equivalent to 1/2 of a cup, 1/4 of a pint, 1/8 of a quart, or 1/32 of a gallon.
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