Does fuel weigh more when hot or cold?

Answer 1

The weight won't change a bit. Weight is proportional to mass, which is related to the amount of matter, and matter may be neither created nor destroyed. However, the denisty of the gas changes. It becomes less dense as it heats up. Put another way, a gallon of warm gasoline will weigh less than a gallon of cold gas. The volumes are the same, but since the densities are different, they don't have the same weight. But if you started with, say, 10 pounds of gas, you would still have ten pounds of gas no matter what its temperature. BTW, when pilots fuel their planes, they measure the fuel in pounds rather than gallons. A thousand pounds of fuel is a thousand pounds of fuel no matter what its temeprature, so the pilot can determine whether or not he can make his destination without having to throw mama from the plane.

Answer 2

If you have bought a given amount of gas, say 20 gallons, at 5 degC and then go to an area where it is say 30degC, that gas will weigh exactly the same as when you bought it. However if you buy it from the pump at 30degC, one gallon will weigh less than it would at 5 degC, because liquids expand when heated, and become less dense. The difference is not great, but it is a feature of buying it by volume not weight.

Answer 3

Fuel will weigh more when it is cold because lower temperatures cause the fuel to contract and become denser, resulting in a higher weight per unit volume. Conversely, when fuel is heated, it expands and becomes less dense, leading to a lower weight per unit volume.

Answer 4

The volume area increases causing density to decrease while the total mass does not increase.

Answer 5

the mass is the same. so neither

Liquids Weighs MORE when cold as it is more dense