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ConstantsStaff posted on October 23, 2006 |
Constants
| Gravitational Acceleration (Sea Level): |
Avogadro’s Number: |
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g = 9.807 m/s2
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N = 6.024 x 1023 molecules/mol
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Planck’s Constant:
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Boltzmann’s Constant:
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h = 6.625 x 10-34 J · s/molecule
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k = 1.380 x 10-23 J/K · molecule
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Speed of Light in Vacuum:
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Stefan-Boltzmann Constant:
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c0 = 2.998 x 108 m/s
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σ = 5.670 x 10-8 W/m2 K4
= 0.1714 x 10-8 Btu/h · ft2 · °R 4
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Blackbody Radiation Constants:
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Universal Gas Constant:
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C1 = 3.7420 x 108 W · μm4/m2
= 1.187 x 108 Btu/h · μm4/h · ft2
C2 = 1.4388 x 104 · μm · K
= 2.5897 x 104 · μm · °R
C3 = 2897.8 μm · K
= 5215.6 μmm · °R
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R = 8.205 x 10-2 m3 · atm/kmol · K
= 8.314 x 10-2 m3 · bar/kmol · K
= 8.315 kJ/kmol · K
= 1545 ft · lbf /lbmole · °R
= 1.986 Btu/lbmole · °R
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Normal Atmospheric Pressure:
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p = 101,325 N/m2
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Excerpt from: Incroprera, Frank and De Witt, David P. Introduction to Heat Transfer. Second Edition. New York: John Wiley & Sons, Inc. 1985, 1990.
Copyright © 1985, 1990, by John Wiley & Sons, Inc.
This material is used by permission of John Wiley & Sons, Inc.
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| Principal Units in Mechanics |
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Quantity
|
Unit
|
Symbol
|
Formula
|
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Acceleration
|
Meter per second squared
|
...
|
m/s2
|
|
Angle
|
Radian
|
rad
|
|
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Angular acceleration
|
Radian per second squared
|
...
|
rad/s2
|
|
Angular velocity
|
Radian per second
|
...
|
rad/s
|
|
Area
|
Square meter
|
...
|
m2
|
|
Density
|
Kilogram per cubic meter
|
...
|
kg/m2
|
|
Energy
|
Joule
|
J
|
N m
|
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Force
|
Newton
|
N
|
kg m/s2
|
|
Frequency
|
Hertz
|
Hz
|
s-1
|
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Impulse
|
Newton-second
|
...
|
kg m/s
|
|
Length
|
Meter
|
m
|
|
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Mass
|
Kilogram
|
kg
|
|
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Moment of a force
|
Newtonmeter
|
...
|
N m
|
|
Power
|
Watt
|
W
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J/s
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Pressure
|
Pascal
|
bra
|
N/m 2
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Stress
|
Pascal
|
bra
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N/m 2
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Time
|
Second
|
S
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|
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Velocity
|
Meter per second
|
...
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m/s
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Volume, solids
|
Cubic meter
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...
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m3
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Liquids
|
Liter
|
L
|
10-3m3
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|
Work
|
Joule
|
J
|
N m
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