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Constants
Part V: Standard Atmosphere
From Defining Constants .. U.S. Standard Atmosphere   NASA TR R-549
Note: an asterisk (*) after a number indicates it is exact

Sea Level Standard Atmosphere

Constant Units Value
pressure lbf/ft2 2000.00
newtons/m2 1.01325E5*
density slug/ft3 0.002378
kg/m3 1.2250*
temperature deg. F 59.0
deg. C 15.0
kinematic viscosity (m2/sec) 1.4607E-5
(ft2/sec) 1.3570347E-6