656 



Tables 866-869 

 TABLE 866. — Relative Viscosity of Water; High Pressure Variation 



(Bridgman, 1925.) 



kg/cm 2 i 500 IOOO 



o° C 1.000 0.938 0.921 



10.3 779 -755 -743 



30 488 .500 .514 



yo° 222 .222 .239 



I 0000 I IOOO 



1.058 1. 126 



TABLE 867.- 



-Viscosity of Mercury; High Pressure Variation 



(Bridgman, 1927.) 



Pressure kg/cm 2 1 2000 4000 6000 8000 10000 12000 



Abs. vise. 30° 0.01516 0.01588 0.01663 0.01742 0.01825 0.01913 0.02008 



75° OI 34i -OI399 -01463 .01528 .01599 .01675 -OI757 



% increase 30 o 5.1 9.9 15.2 20.0 26.3 33.5 



75° o 4.6 9.6 14.4 18.8 24.7 31. 1 



TABLE 868. — Viscosity of Some Glasses at High Temperatures 



TABLE 869. — Some Possible Accuracies, 1928 



(Journ. Wash. Acad. Sci., 18, 503, 1928.) 

 Pienkowsky : 



30 national prototype kgm (and probably the international kilogram) are remaining 



constant within 0.02 mg or less. 



10"* kg measurable to 1 part in io 4 . 



I " " " " " " 10 s . 



io 3 " " " " " " 10". 



With one type of microbalance 100 mg to 1 mg, 1 part in io 8 to io 6 . 



Curtis : 



1 ohm, 1 to 2 parts in io 7 ; 1 millimicrohm with 10%, also megamegohm. 



1 volt, 1 in I0 T ; 1 microvolt, 1%; 1 megavolt, 10%. 



1 ampere, 1 in io 6 ; micromicroampere 10%; kiloampere 1 in io 4 . 



1 millihenry, 1 in io B ; millimicrohenry, 10%; kilohenry 1%. 



1 microfarad, 1 in io 5 ; micromicrofarad, 1%; millifarad 1%. 



Smithsonian Tables 



