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OCR for page 161
The National Academies Summit on America’s Energy Future: Summary of a Meeting
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
OCR for page 162
The National Academies Summit on America’s Energy Future: Summary of a Meeting
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