Question

under what conditions gases can be liquefied in which from LPG is filled in the gas cylinder

Answer 1

LPG is the composition of hardrocarbons of propane (C3H8)and butane (C5H10).
according to concept of critical temperature, pressure. any gases can be liquefied by reducing at specific temperature is known as critical temperature .

LPG is gas in normal conditions ( at room temperature ) . But we can condense and liquefied it under moderate pressure . Or , we can liquefied it by reducing temperature