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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 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 161

OCR for page 161