Question 13
HardOriginal questionLPG is a gas at room temperature, yet it is stored as a liquid in a kitchen cylinder. How is this done?
Show the answer and explanation
CorrectNot quiteAnswer B
Correct answer: B
Explanation
Pressing gas particles close together makes them attract each other enough to form a liquid.
So high pressure (and cooling) liquefies a gas. When the valve opens, the pressure drops and the liquid turns back into gas.
Worth noting
Heating does the opposite: it spreads particles apart. Lowering the pressure would keep LPG a gas.
- Concept
- Liquefaction of gases by pressure
- Typical timeTypical
- 90 s
- Your timeYours
- —
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