164

FLUIDITY AND PLASTICITY

Since this sag in the fluidity curve is due to the mathematical
necessities of the case and not to chemical combination or
dissociation, it is evidently possible to calculate the fluidity of
the mixture from the fluidities and volumes of the components.

400 350

p

/ /

/
^o: vx / / /
'

500

/ A

/
/ /10DC

'•6
13 ^50
LL.

//

//

zoo
/
/ / vr-;
VTT-
Additive Fluid ,alcu1ated by \
^t/idittj Cala by Formula
ity fo1.°/0
jlated

//

B
/
o (
Dbserved Poirv
^5

0 25 50 75 IOC enzene Vriinm«»rftwr«wW«4^ «£Fiu^ ^"he

FIG. 62.—Fluidity-volume concentration curve of mixtures of benzene and ether.
(After D. F. Brown.}

We have seen that the observed specific volume of the mixture

s

whereas the specific volume should be

in order to give a linear fluidity-volume concentration curve
(Eq. (25)), so the specific volume is too small by an amount
represented by the specific volume difference, Av.