HKIIKJMAN. 



THKRMODYNAMIC PROPERTIKS OF WATKR. 



;^,33 



in the final result whether they are ineluded in the mean or not. For 

 convenience in making the computations the pressure was taken in 

 units given conveniently hy the cliangcs of the mangnnin resistance, 

 the inter\als of pressure corresponding to a displacement of the slider 

 of the bridge wire of 5 cm. 



TAHLE 111. 



Comparison of Results by Two Methods for Change of Volume of 



AVater at 20°. 



These results, reduced to 20° are shown compared with the results 

 of the previous determination in Table III. It is seen that the newer 

 results are lower than the former ones, the difference being about 1%, 

 except at the higher pressures, w^here the difference is greater. The 

 agreement is perhaps not as close as could be desired, but at present 

 there seems to be no way of choosing between the results. There is 

 no consistent discrepancy, which would indicate a fundamental error 

 in the present method, such as in the correction applied for the dis- 

 tortion of the ste^l cylinder, for example. If there were any such 

 error it could be eliminated by so choosing the correction as to make 

 the present results agree with the former ones. In the absence of 

 any means of deciding between the two methods therefore, and since 

 the results by the present method reach over a w4der temperature and 

 pressure range, and since also the method has been used much more 

 extensively than the former one and with no greater discrepancy in 

 the individual results, these present results have been accepted as 

 the best ones. But it must be remembered that the ab.solute com- 

 pressibility gi\'en here may be in error by as much as 1% at the higher 

 pressures. This error, however, will not be found to in\'alidate any 

 of the conclusions drawn from the data. 



