Question

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

Answer 1

Reason when gas from a cooking gas cylinder is used, the pressure does not fall appreciably till the last few minutes

• Using high pressure, the gas is held in liquid state within a cooking gas container.

• The boiling point of a liquid is a function of the pressure above its surface. The higher the pressure above the liquid, its boiling point will be greater.

• The vapour pressure inside the container reduces when the gas oven is turned on.

• To compensate for this pressure drop, more liquid undergoes a phase transition (vaporisation) to absorb the earlier pressure.

• In this way, at constant pressure, more and more gas evaporates from the liquefied state.

Answer 2

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