TABLE 269.— RELATIVE VOLUMES OF 



WATER FOR DIFFERENT 



PRESSURES 61 



283 



TABLE 270.— RELATIVE VOL- 

 UMES OF ETHER FOR DIF- 

 FERENT PRESSURES" 1 



61 Bridgman, P. W., Proc. Amer. Acad. Arts and Sci., vol. 66, p. 219, 1931. 



TABLE 271.— COMPRESSIBILITY OF SOLIDS 



If V is the volume of the material under a pressure P megabaryes and Vo is the volume 

 at atmospheric pressure, then the compressibility /3 = — (\/Vo) (dV/dP). Its unit is 

 cmVmegadynes (reciprocal megabaryes). 1 a / /3 is the bulk modulus in absolute units 

 (dynes/cm 2 ). The following values of /3, arranged in order of increasing compressibility, 

 are for P = and room temperature. 1 megabarye = 10 a dynes/cm 2 = 1.020 kg/cm 2 = 

 0.987 atm. 



Compression 



per unit Bulk 

 vol. per modulus, 



megabarye dvnes/ 

 Substance x 10" cm 2 xl0 12 



Tungsten 27 3.7 



Boron 3 3.0 



Silicon 32 3.1 



Platinum 38 2.6 



Nickel 43 2 3 



Molybdenum 46 2.2 



Tantalum 53 1.9 



Palladium 54 1.9 



Cobalt 55 1.82 



Nichrome 56 1.79 



Iron 60 1.67 



Gold 60 1.67 



Pyrite 7 1.4 



Copper 75 1.33 



Manganese 84 1.19 



Brass 89 1.12 



Chromium 9 1.12 



Silver 99 1.01 



Mg. silicate, crys... 1.03 .91 



Mg. silicate 1.21 .82 



Aluminum 1.33 .75 



Calcite 1.39 .72 



Tin 1.89 .53 



Compression 



per unit 



vol. per 



megabarye 



Substance x 10 9 



Gallium 2.09 



Cadmium 2.17 



Plate glass 2.23 



Lead 2.27 



Thallium 2.3 



Antimony 2.4 



Quartz 2.7 



Magnesium 2.9 



Bismuth 3 



Graphite 3.0 



Silica glass 3.1 



Arsenic 4.5 



Calcium 5.7 



Strontium 8.4 



Phosphorus (red) .. 9.2 



Selenium 12.0 



Ice 12 



Sulfur 12.9 



Iodine 13.0 



Sodium 15.6 



Hard rubber 19.4 



Phosphorus (white) . 20.5 



Bulk 



modulus, 



dynes/ 



cm 2 xl0 12 



.48 



.46 



.45 



.44 



.43 



.42 



.37 



.34 



.33 



.33 



.32 



.22 



.175 



.120 



.109 



.083 



.083 



.078 



.077 



.064 



.049 



SMITHSONIAN PHYSICAL TABLES 



