Question-and-Answer Resource for the Building Energy Modeling Community
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Per https://en.wikipedia.org/wiki/British_thermal_unit: "The unit Mbtu is used in natural gas and other industries to indicate 1,000 BTUs. However, there is an ambiguity in that the metric system (SI) uses the prefix "M" to indicate one million (1,000,000). Even so, "MMbtu" is often used to indicate one million BTUs particularly in the oil and gas industry. Energy analysts accustomed to the metric "k" for 1,000 are more likely to use MBtu to represent one million, especially in documents where M represents one million in other energy or cost units, such as MW, MWh and $." I am a die hard user of 'k' for thousands regardless of what comes after it.
