Environmental Engineering Reference
In-Depth Information
TABLE A.1. SI Derived Units
Unit Name
Quantity
Symbol
In Terms of Base Units
Becquerel
Activity of a radionuclide
Bq
s
−1
Coulomb
Quantity of electricity, electric charge
C
A·s
Degree Celsius
Celsius temperature
°C
K
Farad
Capacitance
F
C/V
Gray
Absorbed dose of ionizing radiation
Gy
J/kg
Henry
Inductance
H
Wb/A
Hertz
Frequency
Hz
s
−1
Joule
Energy, work, quantity of heat
J
N·m
Lumen
Luminous flux
lm
cd·sr
Lux
Illuminance
lx
lm/m
2
Newton
Force
N
kg·m/s
2
Ohm
Electric resistance
V/A
Ω
N/m
2
Pascal
Pressure, stress
Pa
Siemens
a
Conductance
S
A/V
Sievert
Dose equivalent of ionizing radiation
Sv
J/kg
Telsa
Magnetic flux density
T
Wb/m
2
Volt
Electric potential, potential difference
V
W/A
Watt
Power, radiant flux
W
J/s
Weber
Magnetic flux
Wb
V·s
a
The siemens was previously called the mho.
TABLE A.2. Multiplicative Factors for Unit Conversion
Quantity
Convert From
Convert To
Multiply By
Area
ac
ha
0.404687
mi
2
km
2
2.59000
Energy
Btu
J
1054.350264
4.184
a
cal
J
kJ/m
2
Energy/Area
ly
41.84
a
Flow rate
cfs
m
3
/s
0.02831685
gpm
L/s
0.06309
mgd
m
3
/s
0.04381
m
3
/d
3785.412
Force
lbf
N
4.4482216152605
a
0.3048
a
Length
ft
m
in.
m
0.0254
a
mi (U.S. statute)
km
1.609344
a
mi (U.S. nautical)
km
1.852000
a
0.9144
a
yd
m
Mass
g
kg
0.001
a
lbm
kg
0.45359237
a
Permeability
darcy
m
2
0.987 × 10
−12
Power
hp
W
745.69987
Pressure
atm
kPa
101.325
a
bar
kPa
100.000
a
mm Hg (at 0°C)
kPa
0.133322
psi
kPa
6.894757
torr
kPa
0.133322
Speed
knot
m/s
0.514444444
Viscosity (dynamic)
cp
Pa·s
0.001
a
m
2
/s
10
−6
a
Viscosity (kinematic)
cs
Volume
gal
L
3.785411784
a
a
Exact conversion.
ly = langley; mgd = million gallons per day.
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