Annual Examination Papers

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School Papers

The equation can explain liquid-condensation

phenomenon – specifically for compressed gas condensing into liquid. Graphical

illustrations and mathematical expressions show the exact occurrence of

coexistence between the two phases. By mathematically manipulating Waals equation

of state, findings show pressure is a convex function of temperature, phase

coexistence is delineated in the graph below. Tc represents critical

temperature, at that point, pressure and temperature are said to be at a mutual

critical point. This point is mathematically expressed as: 0

and .10-11

Further differentiating this equation relative to volume gives a measure of repulsive

force b. Mathematically expressed as: and .12-13

Attractive force a and repulsive

force b are deduced to value and respectively.14

x

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