D
Units of Measure and Equivalences

TABLE D.1 Prefixes for Units in the International System

Prefix

Symbol

Power

Value

Example

kilo

k

103

thousand

kilowatt (kW)

mega

M

106

million

megawatt (MW)

giga

G

109

billion

gigawatt (GW)

tera

T

1012

trillion

terawatt (TW)

peta

P

1015

quadrillion

petagram (Pg)

exa

E

1018

quintillion

exajoule (EJ)

Units of Measure, Abbreviations, and Equivalences

Barrel (bbl) of oil = 0.136 tons of oil

British thermal unit (Btu) = 1,055 joules (J)

CO2 e = carbon dioxide equivalent

gallon (gal) = 3.785 liters

hectare (ha) = 10,000 square meters = 2.47 acres

kilowatt-hour (kWh) = 3.6 × 106 J

liter (l) = 0.2642 gal U.S.

metric ton (tonne) = 1,000 kg = 1.1023 short tons

million barrels of oil per day = 2.24 EJ per year

quad = quadrillion (1015) Btu = 1.055 EJ



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OCR for page 161
D Units of Measure and Equivalences TABLE D.1 Prefixes for Units in the International System Prefix Symbol Power Value Example 103 kilo k thousand kilowatt (kW) 106 mega M million megawatt (MW) 109 giga G billion gigawatt (GW) 1012 tera T trillion terawatt (TW) 1015 peta P quadrillion petagram (Pg) 1018 exa E quintillion exajoule (EJ) Units of Measure, Abbreviations, and Equivalences Barrel (bbl) of oil = 0.136 tons of oil British thermal unit (Btu) = 1,055 joules (J) CO2 e = carbon dioxide equivalent gallon (gal) = 3.785 liters hectare (ha) = 10,000 square meters = 2.47 acres kilowatt-hour (kWh) = 3.6 × 106 J liter (l) = 0.2642 gal U.S. metric ton (tonne) = 1,000 kg = 1.1023 short tons million barrels of oil per day = 2.24 EJ per year quad = quadrillion (1015) Btu = 1.055 EJ 

OCR for page 161