CONVERSION FACTORS
8/23/15, 1:57 PM
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APPENDIX D
CONVERSION FACTORS
Conversion factors may be read directly from these tables. For example,
revolutions, so
. The SI units are fully capitalized. Adapted in
part from G. Shortley and D. Williams, Elements of Physics, 1971, Prentice-Hall, Englewood Cliffs, NJ.
Plane Angle
RADIAN
1
60
3600
1
60
1
3438
1
360
1
Solid Angle
Length
METER
1
100
1
1000
1
3281
1
12
1
1609
5280
1
Area
1
1550
1
1
144
1
Volume
L
1
1000
1
1000
1
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CONVERSION FACTORS
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1
1728
1
Mass
Quantities in the colored areas are not mass units but are often used as such. For example, when we write
location where g has the standard value of
.
g
KILOGRAM
, this means that a kilogram is a mass that weighs 2.205 pounds at a
slug
u
oz
lb
ton
1
1000
1
1
1
1
16
1
2000
1
Density
Quantities in the colored areas are weight densities and, as such, are dimensionally different from mass densities. See the note for the mass table.
1
1
1000
1
1
1728
1
Time
y
d
h
min
SECOND
1
1
24
1440
1
60
3600
1
60
1
Speed
ft/s
km/h
METER/SECOND
mi/h
cm/s
1
1
100
1 1
1
Force
Force units in the colored areas are now little used. To clarify:
value of
.
is the force of gravity that would act on an object whose mass is 1 gram at a location where g has the standard
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CONVERSION FACTORS
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dyne
NEWTON
lb
pdl
gf
kgf
1
1
1
1
1
1000
1
Pressure
inch of water
cm Hg
1
PASCAL
76
2116
1
1 inch of watera at
2491
1
1 centimeter of mercury ata
1
1333
10
1
1
144
1
a
Where the acceleration of gravity has the standard value of
.
Energy, Work, Heat
Quantities in the colored areas are not energy units but are included for convenience. They arise from the relativistic mass-energy equivalence formula
and represent the energy released if a
kilogram or unified atomic mass unit (u) is completely converted to energy (bottom two rows) or the mass that would be completely converted to one unit of energy (rightmost two columns).
Btu
ft ⋅ lb
erg
hp ⋅ h
1
JOULE
cal
1055
1
1
2545
1
1
1
3413
1
1
1
1
Power
WATT
1
1
2545
550
1
1
3413
1
1000
1
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CONVERSION FACTORS
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Magnetic Field
gauss
TESLA
1
milligauss
1000
1
1
Magnetic Flux
maxwell
WEBER
1
1
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