The figure shows plot of PV/T versus for of oxygen gas at two different temperatures.

(a) What does the dotted plot signify?

(b) Which is true: or ?

Solution:

(a) The dotted plot is perpendicular to the x-axis, indicating that is unaffected by . As a result, it represents optimal gas behaviour.

(b) The graph at is closer to ideal behaviour (since it is closer to the dotted line), hence (higher the temperature, ideal behaviour is the higher)