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Constants
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| Gravitational Acceleration (Sea Level): |
Avogadro’s Number: |
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g = 9.807 m/s2 |
N = 6.024 x 1023 molecules/mol |
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Planck’s Constant: |
Boltzmann’s Constant: |
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h = 6.625 x 10-34 J · s/molecule |
k = 1.380 x 10-23 J/K · molecule |
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Speed of Light in Vacuum: |
Stefan-Boltzmann Constant: |
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c0 = 2.998 x 108 m/s |
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: |
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 |
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 | |
|
Quantity |
Unit |
Symbol |
Formula |
|
Acceleration |
Meter per second squared |
... |
m/s2 |
|
Angle |
Radian |
rad |
|
|
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 |
|
Force |
Newton |
N |
kg m/s2 |
|
Frequency |
Hertz |
Hz |
s-1 |
|
Impulse |
Newton-second |
... |
kg m/s |
|
Length |
Meter |
m |
|
|
Mass |
Kilogram |
kg |
|
|
Moment of a force |
Newtonmeter |
... |
N m |
|
Power |
Watt |
W |
J/s |
|
Pressure |
Pascal |
bra |
N/m 2 |
|
Stress |
Pascal |
bra |
N/m 2 |
|
Time |
Second |
S |
|
|
Velocity |
Meter per second |
... |
m/s |
|
Volume, solids |
Cubic meter |
... |
m3 |
|
Liquids |
Liter |
L |
10-3m3 |
|
Work |
Joule |
J |
N m | | |
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