Explanatory Noted and Units of Measure
|Symbols used in the tables:|
|Three dots (. . .) indicate that data are not available or are not separately reported.|
|A dash (-----) indicates that the amount is nil or negligible.|
|A blank space in a table indicates that the item is not applicable.|
|Quads = 1015Btu|
|One metric ton = 1.102 short tons; 1 long ton = 1.20 short tons.|
|Crude oil--1 barrel = 0.36 metric tons = 0.150 short tons|
|Uranium--1 short ton (U3O8) = 0.769 metric tons of uranium|
|One million barrels of oil per day equals:|
|2.1 quads (2.1 × 1015Btu) per year|
|2.2 exajoules (1018joules) per year|
|530 × 1012 kilo calories per year|
|50 million metric tons oil per year|
|76 million metric tons coal per year|
|57 billion cubic meters natural gas per year = 5.9 billion cubic feet per day|
|620 terawatt hours (109kWh) per year|
|Approximately heat content of various fuels and electricity:|
|Crude oil: 1 barrel = 5.8 million Btu|
|Natural gas: 1 cubic foot = 1,030 Btu|
|Coal--1 short ton = 24 million Btu|
|U3O8--1 short ton = 120 million KWh(th) = 409.4 billion Btu (gross)|
|Electricity: 1 kWh=3,412 Btu|
|energy accounting conventions:|
|Coal, natural gas, petroleum--Reported at Btu content of fuel|
|Hydroelectric and geothermal power--Reported at 10,749 Btu/kWh (e) initially,
decreasing to 7,745 Btu/kWh (e)|
|Fossil-fuel electric power generation--Reported at 10,241 Btu/kWh(e) initially,
decreasing to 7,282 Btu/kWh (e)|
|Nuclear electric power generation--Reported at 10,929 Btu/kWh(e) initially, decreasing to 8,415 Btu/kWh(e)|
|Gasified coal--Includes conversion loss equal to 20 percent of synthetic natural
|Shale oil--Includes conversion loss equal to 20 percent of synthetic crude oil produced|
Questia, a part of Gale, Cengage Learning. www.questia.com
Book title: To Choose a Future:Resource and Environmental Consequences of Alternative Growth Paths.
Contributors: Ronald G. Ridker - Author, William D. Watson - Author.
Publisher: Resources for the Future.
Place of publication: Baltimore.
Publication year: 1980.
Page number: xv.
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