In $P$ versus $V$ graph, the horizontal line is found in which ____ exists.

Question

In $P$ versus $V$ graph, the horizontal line is found in which ____ exists., Gas, Liquid, Equilibrium between gas and liquid, Super critical temperature.

MARKS App · Accepted Answer

From the graph, at point $A, \mathrm{CO}_2$ exists as a gas, As pressure is increased, the volume of the gas decreases along the curve $A B$. At $B$ liquefaction of the gas starts. Hence, volume decreases rapidly along $B C$ because liquid has much less volume than the gas. At point $C$, liquefaction is complete. Thus, along horizontal line, gas converts into liquid.

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