Metric conversion factors

Metric conversion factors
(for floorspace)
  Floorspace estimates may be converted to metric units by using the relationship, 1 square foot is approximately equal to .0929 square meters. Energy estimates may be converted to metric units by using the relationship, 1 Btu is approximately equal to 1,055 joules. One kilowatthour is exactly 3,600,000 joules. One gigajoule is approximately278 kilowatthours (kWh).
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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