The volume of a gallon of water is .... one gallon! A gallon is a volumetric measurement. One US gallon is 0.133681 cubic feet, or 3.785411 litres, or 0.832674 UK gallons. One UK gallon is 0.160544 cubic feet, or 4.54609 litres, or 1.20095 US gallons.
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A gallon is a "Standard" unit, and there is no standard unit for mass. The closest thing is weight, so the WEIGHT of a gallon of water is approximately 8 pounds. If you want mass, you have to convert to metric units, and the mass of a gallon of water is approximately 3.6 kilograms.
One gallon of water has a mass of approximately 8.34 pounds, or about 3.785 kilograms.
About 8.35 pounds for one US gallon of water.
Density is calculated as mass per unit volume, so to find the density in pounds per gallon, you would divide the weight (mass) of a gallon of water (9.4 pounds) by the volume of a gallon (1 gallon). Therefore, the density of water in pounds per gallon is 9.4 pounds.
A gallon of water is bigger than a kilogram in terms of volume. However, a kilogram is heavier than a gallon of water because a kilogram measures weight, while a gallon measures volume.
"Kg" is a unit of mass. "Gallon" is a volume of space. The gallon may be completely empty, with no mass in it. If the gallon of space has any mass at all in it, then the amount of mass depends on what substance is in the gallon.
The heat content of a gallon of water at a certain temperature can be calculated using the specific heat capacity of water (1 calorie/gram °C). For example, to calculate the heat content of a gallon of water at 20°C, you would need to know the mass of the water and apply the formula: heat content = mass of water x specific heat capacity x temperature change.