# P While Gas from a Cooking Gas Cylinder is Used, the Pressure Does Not Fall Appreciably Till the Last Few Minutes. Why? - Physics

Short Note

While gas from a cooking gas cylinder is used, the pressure does not fall appreciably till the last few minutes. Why?

#### Solution

Inside a cooking gas cylinder, the gas is kept in the liquid state using high pressure. Boiling point of a liquid depends on the pressure above its surface. Higher the pressure above the liquid, higher will be its boiling point.

When the gas oven is switched on, the vapour pressure inside the cylinder decreases. To compensate this fall in pressure, more liquid undergoes phase transition (vapourisation) to build up the earlier pressure. In this way, more and more gas evaporates from the liquified state at constant pressure.

Concept: Kinetic Theory of Gases - Concept of Pressure
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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 2 Kinetic Theory of Gases
Short Answers | Q 2 | Page 32