144 



BRIDGMAN. 



numerical Aalues for liquid mercury, since the range of the previous 

 measurements has now been considerably extended. The results 

 are shown in Table XX. 



TABLE XX. 



Liquid Mercury. 



The measurements on liquid sodium did not cover so wide a range 

 as those on liciuid mercury, but within the range they show the same 

 characteristics. At 200° the instantaneous pressure coefficients at 

 0, 6000, and 12000 kg. respectively are 0.04922, 0.04594, and 0.04396. 

 The relative decrease with rising pressure is considerably greater than 

 is the case with mercury, and furthermore, the coefficient itself is 

 considerably greater. The mean temperature coefficient lietween 180° 

 and 200° is'o.00325 at kg., and 0.00244 at 12000 kg. This decrease 

 is relatively not so large as that of mercury, although the coefficient 

 itself is larger. 



Potassium was liquid over a still smaller range than sodium, so that 

 it is not possible to gi^e as complete results. The instantaneous 

 pressure coefficient decreases with rising pressure, the values at 165° 

 being 0.000168 and 0.000136 at and^ 6000 kg. respectively. The 

 average temperature coefficient between 135° and 165° increases 

 from 0.00322 at kg. to 0.00463 at 5000 kg., which is the reverse of 

 the behavior of liquid sodium and mercury. The variation with 

 temperature of the pressure coefficient is also abnormal. The initial 



