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1 oz wt. = 0.96 fl-oz
1 fl-oz = 1.04 oz wt.
Definition of ounces of water provided by TheFreeDictionary
A fluid ounce is a unit of volume (also called capacity) typically used for measuring liquids. Whilst various definitions have been used throughout history, two remain in common use: the imperial and the United States customary fluid ounce. An imperial fluid ounce is 1/20 of an imperial pint, 1/160 of an imperial gallon or approximately 28.4 ml. A US fluid ounce is 1/16 of a US fluid pint, 1/128 of a US liquid gallon or approximately 29.6 ml.
Definition of US fluid ounce of water provided by WikiPedia
One US fluid ounce is 1⁄16 of a US pint, 1⁄32 of a US quart, and 1⁄128 of a US gallon. The teaspoon, tablespoon, and cup are defined in terms of a fluid ounce as 1⁄6, 1⁄2, and 8 fluid ounces. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, but in the US it is defined as 1⁄128 of a US gallon. Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois.