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

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प्रश्न

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

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उत्तर

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.    

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Kinetic Theory of Gases - Concept of Pressure
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पाठ 2: Kinetic Theory of Gases - Short Answers [पृष्ठ ३२]

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एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
पाठ 2 Kinetic Theory of Gases
Short Answers | Q 2 | पृष्ठ ३२

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Use R=8.314J K-1 mol-1


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Use R = 8.3 J K−1 mol−1


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Use R = 8.3 J K-1 mol-1


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