@_YasmineG_ they are the same - see http://www.energyvortex.com/energydictionary/british_thermal_unit_(btu)__mbtu__mmbtu.html …
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@_YasmineG_ they are the same - see http://www.energyvortex.com/energydictionary/british_thermal_unit_(btu)__mbtu__mmbtu.html …