and 



BRIDGMAN. — WATER UNDER PRESSURE. 



log(— *) = 1.1239 — 10, 



455 



the correction given by the deviation curve of Figure 3. It is to be 

 noticed that both of these formulas, for 0° and 22°, take as the unit 

 of volume the volume which the given quantity of water occupies under 

 unit pressure at 0° or 22° respectively. To find the change of volume 

 of 1 gm. of water, a correction must be applied for thermal dilatation 

 between 0° and 22°. 



W 



005 

 .OOA 



2 .OOZ 



P J00\ 



p 



OC -.001 

 O -002 

 H -.003 



PBESSURE.KGM/CM'XIO." 



Figure 2. The deviation curve for water at 0°. This is to be used in 

 combination with the formula on page 453 in determining the change of 

 volume at 0° C. 



These data may be compared with those of Amagat ^ (Table V.). 

 In making this comparison, it must be borne in mind that this is a dis- 

 proportionally severe test of these data. Values taken from the low 

 end of a large range cannot be expected to show as small a percentage 

 of error as will values obtained with apparatus designed only for this 

 smaller range. In the present work very few actual experimental points 

 were found below 1000 kgm. ; the lower end of the curve is virtually an 



1 Amagat, Ann. de Chim. et Phys. (6), 29, 68-136, 505-574 (1893). 



