ut not yet ratified- (9) Afghanistan,
Angola, Belarus, Dominican Republic, Liberia, Libya, Madagascar,
Rwanda, Sao Tome and Principe
Wetlands see Convention on Wetlands of International Importance
Especially As Waterfowl Habitat (Ramsar)
Whaling see International Convention for the Regulation of Whaling

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@APPENDIXES

Appendix E: Weights and Measures

Mathematical Notation

Mathematical Power Name
1018or 1,000,000,000,000,000,000 one quintillion
1015or 1,000,000,000,000,000 one quadrillion
1012or 1,000,000,000,000 one trillion
109or 1,000,000,000 one billion
106or 1,000,000 one million
103or 1,000 one thousand
102or 100 one hundred
101or 10 ten
100or 1 one
10-1or 0.1 one tenth
10-2or 0.01 one hundredth
10-3or 0.001 one thousandth
10-6or 0.000 001 one millionth
10-9or 0.000 000 001 one billionth
10-12or 0.000 000 000 001 one trillionth
10-15or 0.000 000 000 000 001 one quadrillionth
10-18or 0.000 000 000 000 000 001 one quintillionth

Metric Interrelationships

Prefix Symbol Length, weight, or capacity Area Volume
exa E 1018 1036 1054
peta P 1015 1030 1045
tera T 1012 1024 1036
giga G 109 1018 1027
mega M 106 1012 1018
hectokilo hk 105 1010 1015
myria ma 104 108 1012
kilo k 103 106 109
hecto h 102 104 106
basic unit -- 1 meter, 1 gram, 1 liter 1 meter2 1 meter3
deci d 10-1 10-2 10-3
centi c 10-2 10-4 10-6
milli m 10-3 10-6 10-9
decimilli dm 10-4 10-8 10-12
centimilli cm 10-5 10-10 10-15
micro u 10-6 10-12 10-18
nano n 10-9 10-18 10-27
pico p 10-12 10-24 10-36
femto f 10-15 10-30 10-45
atto a 10-18 10-36 10-54

Conversion Factors

To Convert From To Multiply by
acres ares 40.468 564 224
acres hectares 0.404 685 642 24
acres square feet 43,560
acres square kilometers 0.004 046 856 422 4
acres square meters 4,046.856 422 4
acres square miles (statute) 0.001 562 50
acres square yards 4,840
ares square meters 100
ares square yards 119.599
barrels, US beer gallons 31
barrels, US beer liters 117.347 77
barrels, US petroleum gallons (British) 34.97
barrels, US petroleum gallons (US) 42
barrels, US petroleum liters 158.987 29
barrels, US proof spirits gallons 40
barrels, US proof spirits liters 151.416 47
bushels (US) bushels (British) 0.968 9
bushels (US) cubic feet 1.244 456
bushels (US) cubic inches 2,150.42
bushels (US) cubic meters 0.035 239 07
bushels (US) cubic yards 0.046 090 96
bushels (US) dekaliters 3.5