240

FLUIDITY AND PLASTICITY

TABLE LXIII.—THE EFFECT OF VARYING THE RADIUS OF THE CAPILLARY
ON THE "VISCOSITY OF A SOLID" (AFTER GLASER)

Temperature,
Radius,
Length,
Time,
Volume,
"Viscosity,"

degrees C
centimeters
centimeters
seconds
centimeters
absolute

12.2
1.525
25.1
16,200
0.331
4.59X109

12.3
1.241
15.9
43 , 200
11.20
4.54X109

12.3
1.019
15.9
173,000
2.060
4.59X109

12.3
0.746
16.0
258 , 000
0.756
5.62X109

12.3
0.576
15.1
171,000
0.129
7.91X103

12.3
0.364
15.8
350,000
0.0866
25.2X109

tain peaks maintain their sharp outlines through geological ages
whereas ice flows steadily in spite of apparent hardness. This
indicates that the friction constant of ice is incomparably lower
than that of most silicate rocks. Whereas the glacier scrapes its
bed to some extent (slipping), there is an abundance of evidence
that there is differential flow in the glacier mass, so that although
regelation introduces a new factor into the problem, the flow is
essentially plastic in its nature.