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1 g wt. = 0.00022 gal Imp.
1 gal Imp. = 4,546.09 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 U.K. gallon of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).