Gallon is volume, PSI is pressure. They're different things and don't translate.
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1 gallon
4 qts in a gallon
1 gallon is roughly equal to 4.5 litres.
There are 16 cups in a gallon and half a gallon is equal to 8 cups.
1 gallon = 4 quarts 1/2 gallon = 2 quarts