BRIDGMAN. — WATER UNDER PRESSURE. 



519 



on this curve than for any other. It was on this curve, for instance, 

 that the test was made of the possibility of interaction between water 

 and the substances in contact with it. The water was used in steel or 

 copper or glass vessels, in contact with kerosene or gasolene or mercury. 

 No difference in the equilibrium pressures could be found with any of 



« 



^.100 



^.030 

 o 



2-080 



>.O70 



O 



y.oGo 



z 



< 

 I 



,050 



• 



— . *r%^ 



• ^ 



-20' -10' 0° 10' 20" 30° 40' 50" 

 TEMPERATURE 



Figure 33. The change of volume when VI passes to the liquid. 



these different forms of apparatus, but below zero it did seem desirable 

 to use gasolene instead of kerosene. Figure 31 shows piston displace- 

 ment aaainst pressure for one of the points on this line. The corners 

 of the curve were seldom more rounded than here. The pressure 

 measurements on this curve were made with six different manganin 

 coils. 



Figure 32 shows that the equilibrium curve runs perfectly smoothly, 

 without incident of any kind, from the lowest temperature of the sub- 

 cooled region, —17°, to the highest temperature and pressure, 76° and 

 20,500 kgm. The curve is convex upward, like all the other curves of 

 equilibrium between the liquid and the other solid forms of water. At- 

 tention is called to the five bad points lying off the equilibrium curve 

 at the lower end. 



The change of volume is shown in the same table with the equilib- 

 rium points, and graphically in Figure 33. All the values that were 



