IF the volume of gas is plotted against the reciprocal of pressure, the slope will be given as
Slope = ^V/_1/P = P x V
thus the unit of the slope will be;

P =	Force
	Area

= Nm^-2, = V = M³ = NM.
The unit NM (Newton - Meter) is the practical unit of work, which is the product of force (N) and Displacement (M).
Note: It should be noted that the practical unit of work is Newton-Meter, whereas its S.I unit is Joules, just as energy.