Page 62 - Aeronautical Engineer Data Book

Section 3

Symbols and notations

3.1 Parameters and constants
See Table 3.1.
Table 3.1 Important parameters and constants
Planck’s constant (h) 6.6260755 10 –34 J s
Universal gas constant (R) 8.314510 J/mol/K
2
–8
Stefan–Boltzmann constant ( ) 5.67051 10 W/m K 4
Acceleration due to gravity (g) 9.80665 m/s 2
2
(32.17405 ft/s )
Absolute zero –273.16°C (–459.688°F)
Volume of 1 kg mol of ideal 22.41 m 3
gas at 1 atm, 0°C
26
Avagadro’s number (N) 6.023 10 /kg mol
Speed of sound at sea level (a 0 ) 340.29 m/s
(1116.44 ft/sec)
Air pressure at sea level (p 0 ) 760 mmHg
5
= 1.01325 10 N/m 2
= 2116.22 lb/ft 2
Air temperature at sea level (T 0 ) 15.0°C (59°F)
3
Air density at sea level ( 0 ) 1.22492 kg/m (0.002378
3
slug/ft )
2
–5
Air dynamic viscosity at sea 1.4607 10 m /s
2
–4
level (µ o ) (1.5723 10 ft /s)
3.2 Weights of gases
See Table 3.2.
Table 3.2 Weights of gases
Gas kg/m 3 lb/ft 3
Air 1.22569 0.07651 (at 59.0°C)
Carbon dioxide 1.97702 0.12341
Carbon monoxide 1.25052 0.07806
Helium 0.17846 0.01114
Hydrogen 0.08988 0.005611
Nitrogen 1.25068 0.07807
Oxygen 1.42917 0.089212
All values at atmospheric pressure and 0°C.