How much does one gallon of soda weigh?

The volume measure of a cup is 236.6 milliliter or 236.6 cubic centimeter. Only if you think of pure water, you can say: 1 Milliliter weighs 1 gram. 1 cup of pure water weighs 236.6 grams. The liquid coffee is close to water, so a cup of coffee will weigh approximately the same as a cup of water.