How to determine whether a substance is liquid or vapour at certain temp
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by looking its boiling and melting points
tausif59:
Well !! your answer is also right !!
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Here's your answer !!
Gases become more difficult to liquefy as the temperature increases because the kinetic energies of the particles that make up the gas also increase. The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.
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