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Reference Tables -- Common Physical Constants

 


Common Physical Constants
Acceleration of gravity, g 32.17 ft/s2 = 9.807 m/s 2
Speed of Light in a Vacuum 299,792,458 m/sec
Density of water 62.4 lbm/ft3 = 1 g/cm3
1 gal H2 O = 8.345 lbm
Gas Constant, R 1545 ft-lbf/pmole-R = 8.314 J/gmole-K
Gas volume (STP: 68F, 1 atm) 359 ft 3 /pmole = .02241 m3 /gmole
Joule's Constant, J 778 ft-lbf/BTU
Poisson's ratio, .3 (for steel)
Modulus of Elasticity (steel) 30 X 10 6 psi
Common Steel Densities:
Carbon & Low-Alloy Steels 0.283 lbm/in 3 = 7.84 g/cm3
304 SS 0.29 lbm/in 3 = 7.88 g/cm3
Tool Steels Carbon Steels X 1.000
Moly High Speed Carbon Steels X 1.035
Multiphase Alloys Carbon Steels X 1.074
Steel Tensile Strength (psi) ~ 500 X Brinell Number

 


 

 

 

 

 


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