Question: what is mmbtu hr of natural gas?
Answer: The units MBtu and MMBtu are used in the natural gas and other industries to indicate 1,000 and 1,000,000 BTUs, respectively. However, there is an ambiguity in that the metric system uses the prefix "M" to indicate one million (1,000,000), and consequently "MBtu" is often used to indicate one million BTUs.