Units of measurement
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Gigajoule (GJ)
British Thermal Unit (BTU)
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Gigajoule (GJ)
Gigajoule (GJ) — 1,000,000,000 joules, applied in energy and heat production.
British Thermal Unit (BTU)
British Thermal Unit (BTU) — a unit of energy used in the US and UK, approximately equal to 1055 joules.