671 



TABLE 729.— COMPARATIVE PROPERTIES OF ORDINARY AND 

 HEAVY WATER* 



Property H a O HVO 

 Specific gravity at 25 C C relative to ordinary water 



at 25°C 1.0000 1.1079 



Temperature of maximum density 4.0° C 11.6°C 



Dielectric constant 81.5 80.7 



Surface tension 72.75 dynes/cm 67.8 



Viscosity at 10°C 13.10 millipoises 16.85 



Melting point .000°C 3.802°C 



Boiling point (76 cmHg pressure) 100.00°C 101.42°C 



Heat of fusion 1436 cal/mole 1510 



Heat of vaporization at 25°C 10484 cal/mole 10743 



Refractive index at 20°C for NaD line 1.33300 1.32828 



* For reference, see footnote 224, p. 665. 



TABLE 730.— THE MECHANICAL EFFECTS OF RADIATION 



280 Nat. Res. Council Bull. 80, 1931. 



SMITHSONIAN PHYSICAL TABLES 



