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1 g wt. = 0.034 fl-oz
1 fl-oz = 29.57 g wt.
Definition of grams of water provided by Dictionary.com
The basic unit of measurement for mass in the metric system; one cubic centimeter of water has a mass of approximately one gram.
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.