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Quad (British/American), energy
A Quad is a unit of energy equal to 1015 BTU, or 1.06 * 1018 Joule in SI units.
1 Quad
is equal to
7.78×1017 foot-pound
British/American
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1
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10,000,000,000
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1015
-
7.78×1017
Other
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2.52×1014
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2.52×1017
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2.52×1011