146

FLUIDITY AND PLASTICITY

contains an additional term, which becomes negligible when the
fluidity is large.

That the fluidity isothermals of carbon dioxide do not in any
way resemble the volume isothermals as we pass into the gaseous

FIG. 56.—The fluidity isothermals of carbon dioxide based on the measurements
of Phillips.
condition is sufficiently obvious from inspection of Fig. 56,
plotted from Phillips' data. The continuous curves are drawn
between observed points. The broken lines are added for
diagrammatic purposes. The left half of the figure, correspond-
ing to low fluidity and temperature, presents a strong similarity