1 therm = 100,000 Btu = 0.1 MMBtu = 1 CCF
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1.00 Ccf equals 2.8317 m3
ccf refers to 100 cubic feet and hcf refers to highest common factor
In the case of MW-hr, the M is an abbreviation for 106 ... whereas in the case of MMBtu and MMkcal, M is an abbreviation for 103. This is an unfortunate irregularity, but one which is actually in use.
An MMBtu is a million Btu. 1 kilowatt hour = 3412 Btu, approx = 0.003 412 MM Btu. Originally, MBtu represented 1000 Btu, from the Roman numeral M = 1000. However, this often got confused with the SI prefix "Mega", meaning 1 million. The prefix MM was introduced to get around this confusion.
The no. of entities that can be associated with another entity. For eg. 1-1, 1-many, many-1 and many-many