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The National Academies Summit on America's Energy Future: Summary of a Meeting (2008)

Chapter: Appendix D: Units of Measure and Equivalences

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Suggested Citation:"Appendix D: Units of Measure and Equivalences." National Research Council. 2008. The National Academies Summit on America's Energy Future: Summary of a Meeting. Washington, DC: The National Academies Press. doi: 10.17226/12450.
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Page 161
Suggested Citation:"Appendix D: Units of Measure and Equivalences." National Research Council. 2008. The National Academies Summit on America's Energy Future: Summary of a Meeting. Washington, DC: The National Academies Press. doi: 10.17226/12450.
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Page 162

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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

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There is a growing sense of national urgency about the role of energy in long-term U.S. economic vitality, national security, and climate change. This urgency is the consequence of many factors, including the rising global demand for energy; the need for long-term security of energy supplies, especially oil; growing global concerns about carbon dioxide emissions; and many other factors affected to a great degree by government policies both here and abroad.

On March 13, 2008, the National Academies brought together many of the most knowledgeable and influential people working on energy issues today to discuss how we can meet the need for energy without irreparably damaging Earth's environment or compromising U.S. economic and national security-a complex problem that will require technological and social changes that have few parallels in human history.

The National Academies Summit on America's Energy Future: Summary of a Meeting chronicles that 2-day summit and serves as a current and far-reaching foundation for examining energy policy. The summit is part of the ongoing project 'America's Energy Future: Technology Opportunities, Risks, and Tradeoffs,' which will produce a series of reports providing authoritative estimates and analysis of the current and future supply of and demand for energy; new and existing technologies to meet those demands; their associated impacts; and their projected costs. The National Academies Summit on America's Energy Future: Summary of a Meeting is an essential base for anyone with an interest in strategic, tactical, and policy issues. Federal and state policy makers will find this book invaluable, as will industry leaders, investors, and others willing to convert concern into action to solve the energy problem.

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