Usually we check gas remaining in cylinder by lifting it up and checking its weight. But I will tell the easiest way to check it with water. Because of its high cost, everyone is careful to save the gas they use for cooking. However, since steel and other cylinder materials are opaque, we cannot see what’s within our gas supplies.
For that take a bowl of water and piece of cloth.Dip the cloth in water and remove the excess of water and then wipe one side of the gas cylinder with wet cloth;wipe it thoroughly.
 Now wait patiently for 5 minutes .Once 5 minutes get over you will see that some area of the gas cylinder is completely dry and the below part is still wet .With this we can assure that the wet area of the gas cylinder still contain gas and above portion which is dried fully is empty.This is how we can easily the determine the level of gas in the cylinder.
ways of accurately checking how much gas is in a metal cylinder is to pour hot water down the side you’ll then be able to use your hand to detect where the temperature of the cylinder turns from warmer to colder. You can work out the practicalities of that for yourselves, but it’s otherwise very accurate.
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