You're going camping and are thinking of carrying 3 gallons of water. How much does the water weigh, in units of pounds?

The water would weigh 25.04 pounds.

Explanation:

Mass = volume * density

Given;

Volume of water = 3 gallons of water

Density of water = 1000kg/m^3

Converting the density to pounds per gallon.

Density = 1000kg/m^3 * 2.205pounds/kg * 1/264.172gallon/m^3

Density = 8.347 pounds/gallon

Therefore, the mass can be calculated as;

Mass = 3 gallons * 8.347pounds/gallon

Mass = 25.04 pounds

Therefore, the water would weigh 25.04 pounds.