How much does 1 inch by 1inch by 1 inch of water weigh?

Answer 1

A1. Being 2.54x2.54x2.54 cm3 it must weigh 2.54x2.54x2.54 grams.

A2. And as you know, a gallon of water weighs 10 lbs, and there are 6.25 gallons of water in a cubic foot. And a cubic foot contains 12^3 cubic inches = 1728 cu in.

So we have more than enough data, so a cubic inch is 1/1728 of a cubic foot, and a cubic foot weighs 62.5 lbs. So just divide 62.5 by 1728, and there is your answer.

Unless of course, you don't use an imperial gallon, in which case you'll appreciate the increasingly broad acceptance of SI units. And accept A1 above.