Effects of Gas Release from LPG Cylinder on Contents

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Discussion Overview

The discussion revolves around the effects of gas release from an LPG cylinder on the temperature of the contents and the potential condensation of water vapor on the surface of the cylinder. It includes theoretical considerations and anecdotal experiences related to gas behavior and temperature changes.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asserts that the release of gas from an LPG cylinder causes a cooling effect on the contents.
  • Another participant references the Ideal Gas Law, suggesting that a decrease in pressure while maintaining volume leads to a decrease in temperature.
  • A participant confirms that water vapor can condense on the surface of the bottle and potentially freeze, particularly when gas is continuously released.
  • Experiential anecdotes are shared regarding the freezing effect of CO2 fire extinguishers, indicating similar phenomena with rapid gas release.

Areas of Agreement / Disagreement

Participants express agreement on the cooling effect of gas release and the condensation of water vapor, but the discussion includes anecdotal evidence and personal experiences that may not be universally applicable. No consensus is reached on the specifics of the freezing process or conditions.

Contextual Notes

Participants reference the Ideal Gas Law and personal experiences, but the discussion lacks detailed mathematical analysis or empirical data to support claims. Assumptions about the conditions under which gas is released and the environment are not fully explored.

Who May Find This Useful

Individuals interested in thermodynamics, gas behavior, and practical applications of gas release in various contexts may find this discussion relevant.

AnthreX
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The change in pressure, caused by the release of gas from an Lpg cylinder, will cool the contents.

i am pretty sure that it does cool the contents.

would the water vapour condense on the surface of the bottle and freeze?
if the gas continues to be released.
 
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Ideal Gas Law: PV= NRT. If Pressure is decreased while Volume remains the same (as in a rigid metal "bottle") Temperature decreases.

"would the water vapour condense on the surface of the bottle and freeze?"

Yes, water vapour in the air outside bottle will form a frost on the bottle. It melts fairly rapidly once you have stopped releasing the gas. When I was young and foolish (I'm not young any more), I worked at a place that dispensed LPG. You had to be very careful not freeze your own hand!
 
It is the same with CO2 fire extinguishers - if you hold the cone shaped nozzle when using it, you'll freeze your hand to it!
 
alright thanks for your time and great replies
 

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