Environmental Engineering Reference
In-Depth Information
Table A.1 Derived Units Common to Geotechnical Engineering
Physical Quantity
SI Unit
Symbol
m/s
2
Acceleration
Meters per square second
m
2
Area
Square meter
kg/m
3
Density
Kilograms per cubic meter
m
3
/s
Discharge, flux
Cubic meters per second
Force
Newton
N
Length
Millimeter
mm
Length
Meter
m
Mass
Kilogram
kg
Moment or torque
Newton meter
Nm
Permeability
Meters per second
m/s
Power
Watt
W
Pressure
Newtons per square meter (i.e., pascal)
Pa
Stress
Newtons per square meter (i.e., pascal)
Pa
Temperature
Kelvin
K
Time
Second
s
N/m
3
Unit weight
Newtons per cubic meter
Velocity
Meters per second
m/s
Ns/m
2
Viscosity (dynamic)
Newton second per square meter
m
3
Volume
Cubic meter
Volume
Liter
L
Weight
Newton
N
Work (energy)
Joule
J
Table A.3 Conversion Factors for British Engineering
and SI System
British System
SI
Length
1 inch, in.
25.4mm
=
0.025 m
1 foot, ft
0.3048 m
Table A.2 Prefixes for Basic and Derived Units
1 yard, yd
0.9144 m
Mass
1 pound mass,
1 bm (avoirdupois)
Factor
Prefix
Symbol
0.4536 kg
10
9
Giga
G
1slug
(1 lb-force/ft
2
)
10
6
Mega
M
14.59 kg
10
3
Kilo
k
Force
1 lb-force
10
2
Hecto
h
4.448 N
10
1
Deka
da
Stress and pressure
1 psi (lb-force/in.
2
)
10
−
1
Deci
d
10
3
Pa or 6.895 kPa
6.895
×
10
−
2
Centi
c
10
5
Pa or 101.3 kPa
1 atmosphere
1.013
×
10
−
3
10
5
Pa or 100 kPa
Milli
m
1 bar
1
×
10
−
6
Micro
μ
Density
1 lb-mass/ft
3
10
−
9
16.018 kg/m
3
Nano
n
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