MERCURY AND GI-ASS 



'9 



but fortunately Amagat's results enable us to decide. He found by 

 measuring linear compression that glass possessing below 500 atmo- 

 spheres an average compressibility of 0.00000225 decreased in com- 



PRESSURE 100 



200 



300 400 



Fig. 4. 



500 



600 



possibility only a unit in the last decimal place between 500 and 1 ,000 

 atmospheres. Hence the compressibility of glass is almost a constant, 

 and its curve with increasing pressure practically a straight line. 



