1 gallon = 128 fluid ounces
1/2 gallon = 64 fluid ounces
regardless of what substance may or may not be in it.
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There are 8 cups in 1 gallon of water, so half a gallon would contain 4 cups.
A half gallon is equivalent to 64 ounces. Therefore, 72 ounces is more than a half gallon by 8 ounces.
64 ounces. 1 gallon makes 128 ounces and 1 ounce is 0.0078 gallon in U.S measure. There are 8 ounces in a cup, 2 cups in a pint, 2 pints in a quart and 4 quarts in a gallon. That makes 128 ounces in a gallon US. In UK 20 ounces to the pint, 8 pints to the gallon which makes 160 ounces Imrerial measure.
there are eight half-pints in a half-gallon
1/2 US gallon of pure water weighs about two (1.893) kilos.