For any other pressure p, at which the volume of 1 lb. is V and the
weight per cubic foot is G, the temperature being 32° Fahr.,
pV = p/G = 26214; or G = p/26214. (3)
_Change of Pressure or Volume by Change of Temperature._--Let p0, V0,
G0, as before be the pressure, the volume of a pound in cubic feet,
and the weight of a cubic foot in pounds, at 32° Fahr. Let p, V, G be
the same quantities at a temperature t (measured strictly by the air
thermometer, the degrees of which differ a little from those of a
mercurial thermometer). Then, by experiment,
pV = p0V0(460.6 + t)/(460.6 + 32) = p0V0[tau]/[tau]0, (4)
where [tau], [tau]0 are the temperatures t and 32° reckoned from the
absolute zero, which is -460.6° Fahr.;
p/G = p0[tau]/G0[tau]0; (4a)