162

FLUIDITY AND PLASTICITY

type I, but in cases of doubt resort may be had to a study of
the other physical properties.

I. THE IDEAL MIXTURE
If there is no contraction on mixing two liquids

C-
tO

I-Addi-Kve Sp.Vol.Calc.btj Wf.°/o
H-Observed

0 25 50 75

Benzene ^/e^ Concentration of Ether

100
E+her

FIG. 60.—Specific volume-weight concentration curve of mixtures of benzene
and ether. (After D. F. Brown.)

v =

+

(59)

where v is the specific volume and p the density of the mixture,
containing m weight fraction or a volume fraction of the com-
ponent A whose specific volume is vi = — and n weight frac-

Pi

tion or b volume fraction of the component B whose specific

volume is v$ =

P2

So a =

+

From the above equa-