J
- joule (J)– the basic unit of energy; the equivalent of 1 watt of power radiated or dissipated for 1 second. Natural gas consumption is usually measured in megajoules (MJ), where 1 MJ = 1, 000,000 J. On large accounts it may be measured in gigajoules (GJ), where 1 GJ = 1 000,000,000 J.
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