Table 1 (continued) 



13 



CONVERSION FACTORS 

 I. Pressure: 



N ot e. — The pressure units one standard inch of mercury, one standard millimeter 

 of mercury, and one standard atmosphere are denned in terms of the conventional 

 standard value of gravity 980.665 cm. sec." 2 , which was adopted by the Interna- 

 tional Committee on Weights and Measures. These units have been proposed for 

 general meteorological use. The pressure units one 45° inch of mercury, one 45° 

 millimeter of mercury, and one 45° atmosphere are defined in terms of the best 

 value of gravity at 45° latitude and sea level, 980.616 cm. sec." 2 See introduction, 



page 3. 



1 dyne per square centimeter 

 (dyne cm." 1 ) 



= 1 barye 



= 10" 8 mb. 



= 10^ bar. 

 1 millibar (mb.) 



= 10 3 dynes cm." 3 



= 0.00101972 kg. cm." 2 



= 0.750099 mm. Hg. (45°) 



= 0.750062 mm. Hg. (stand- 

 ard) 



= 0.0295315 in. Hg. (45°) 



= 0.0295300 in. Hg. (stand- 

 ard) 



= 0.0145038 lb. in." 2 

 1 centibar (cb.) 



= 10 mb. 

 1 bar (b.) 



= 10 6 dynes cm. -2 



= 10 s mb. 



= 10 a barye 

 1 standard millimeter of mercury 

 (mm. Hg. (standard)) 



= 1.000050 mm. Hg. (45°) 



= 1.333224 mb. 



= 0.001359504 kg. cm." 2 



= 0.03937205 in. Hg. (45°) 



= 0.03937008 in. Hg.( stand- 

 ard) 



= 0.0193368 lb. in." 2 

 1 45° millimeter of mercury (mm. 

 Hg. (45°)) 



= 0.999950 mm. Hg.( stand- 

 ard) 



= 1.333157 mb. 



= 0.00135944 kg. cm." 2 



= 0.03937008 in. Hg. (45°) 



= 0.0393681 in. Hg. (stand- 

 ard) 



= 0.0193358 lb. in." 2 



1 standard inch of mercury (in. 

 Hg. (standard)) 



= 0.491154 lb. in." 2 



= 33.8639 mb. 



= 0.0345316 kg. cm." 2 



= 25.4013 mm. Hg. (45°) 



= 25.4 mm. Hg. (standard) 



1 45° inch of mercury (in. Hg. 

 (45°)) 



= 0.491130 lb. in." 2 

 = 33.8622 mb. 

 = 0.0345298 kg. cm." 2 

 = 25.4 mm. Hg. (45°) 

 = 25.3987 mm. Hg. (stand- 

 ard) 



1 pound per square inch (lb. in." 2 , 

 psi) 



= 2.03612 in. Hg. (45°) 

 = 2.03602 in. Hg. (stand- 

 ard) 

 = 68.9476 mb. 

 = 0.0703069 kg. cm." 2 

 = 51.7175 mm. Hg. (45°) 

 = 51.7149 mm. Hg. (stand- 

 ard) 



1 standard atmosphere 

 = 1013.250 mb. 

 = 1.03323 kg. cm." 2 

 = 760 mm. Hg. (standard) 

 = 29.9213 in. Hg. (stand- 

 ard) 

 = 14.6960 lb. in." 2 

 = 760.038 mm. Hg. (45°) 

 = 29.9228 in. Hg. (45°) 

 = 1.000050 45° atmosphere 



{continued) 



SMITHSONIAN METEOROLOGICAL TABLES 



