Question

Why is LPG filled in cylinders under pressure?

Answer 1

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LPG is liquefied petroleum gas (usually butane or propane) filled in cylinders under pressure so that the gas remains in liquid state. The cylinders have a valve which regulate the pressure. When the valve is opened the pressure inside the cylinder decreases and the liquid changes into gas which we use to cook food.

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Answer 2

LPG is liquefied petroleum gas (usually butane or propane) filled in cylinders under pressure so that the gas remains in liquid state. The cylinders have a valve which regulate the pressure. When the valve is opened the pressure inside the cylinder decreases and the liquid changes into gas which we use to cook food. Also butane/ propane in gaseous form expand tremendously with increase in temperature so it is not safe to fill them in cylinders in gaseous form.