Environmental Engineering Reference
In-Depth Information
Table A.3
Additional units of the International System of Units (SI) (Système International
d'Unités)
Description
Name
Symbol
Definition
Time
Minute
min
1 min = 60 s
1 h = 3.6 9 10
3
Hour
h
s
1 d = 8.64 9 10
4
Day
d
s
1 a = nrl. 3.155 9 10
7
Year
a
s
1 Ma = 10
6
years = 3.155 9 10
13
Mega year
Ma
s
1 Ga = 10
9
years = 3.155 9 10
16
Giga year
Ga
s
1 = (p 180
-1
) rad
Flat angle
Degree
1 m = 100 centimeter (cm) = 10
3
Length
Meter
m
millimeter
(mm)
1 km = 1,000 m = 10
6
mm = 0.621 mi
Kilometer
km
Conversions
Statute mile
mi
1 mi = 1 760 yd = 1.609 km
Nautical mile
nmi
1 nmi = 1.852 km
Inch
in
1 in = 2.54 cm
Foot
ft
1 ft = 12 in = 0.305 m
Yard
yd
1 yd = 3 ft = 0.914 m
League
lq
1 lq = 3 mi = 4.828 km
Fathom
fa
1 fa = 6 feet = 1.829 m
Cable
cl
1 cl = 608 feet = 185.31 m
Sea league
slq
1 slq = 3 nmi = 5.556 km
m
2
1m
2
=10
4
square centimeter (cm
2
)=10
6
square
millimeter (mm
2
)
Area
Square meter
km
2
1km
2
= 100 hectare (ha) = 10
4
Ar (a) = 10
6
m
2
Square kilometer
Conversions
in
2
1in
2
= 6.45 cm
2
= 6.45 9 10
-4
m
2
Square inch
ft
2
1ft
2
= 144 sq in = 0.093 m
2
Square foot
r
2
1r
2
= 30.25 sq ya = 25.29 m
2
Square rod
Square yard
yd
2
1yd
2
= 9 sq ft = 0.836 m
2
Acre
ac
1 ac = 4,840 sq yd = 4 047 m
2
mi
2
1mi
2
= 2.589 km
2
Square mile
11 = 1 dm
3
Volume
Liter
l
= 0.264 gal (US) = 0.22 gal (UK)
m
3
1m
3
=10
3
cubic decimeter (dm
3
)=10
3
liter (1)
=10
6
cubic centimeter (cm
3
)=10
6
milliliter (ml)
Cubic meter
Conversions
1 ft
3
= 1,728 in
3
= 28.317 dm
3
Cubic foot
cu ft
1 yd
3
=27ft
3
= 0.765 m
3
Cubic yard
cu yd
1 in
3
= 16.387 cm
3
Cubic inch
cu in
Pint (US)
pt (US)
1 pt (US) = 0.473 l
Pint (UK)
pt (UK)
1 pt (UK) = 0.568 l
Quart (US)
qt (US)
1 qt (US) = 2 pints (US) = 0.946 1
Quart (UK)
qt (UK)
1 qt (UK) = 2 pints (UK) = 1.137 1
Gallon (US)
gal (US)
1 gal (US) = 4 quarts (US) = 3.785 l
Gallon (UK)
gal (UK)
1 gal (UK) = 4 quarts (UK) = 4.546 1
1 bbl = 42 gal (US) = 158.987 1 = 0.159 m
3
Barrel (US)
bbl
Dry barrel (US)
dbbl
1 dbbl = 0.1156 m
3
Gross register tonnage
GRT
1 GRT = 100 ft
3
= 2.8317 m
3
(continued)
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