In measuring natural gas, what is mmBtu ?

1 kWh equals  3412 BTU

A standard unit of measurement used to denote both the amount of heat energy in fuels and the ability of appliances and air conditioning systems to produce heating or cooling. A BTU is the amount of heat required to increase the temperature of a pint of water (which weighs exactly16 ounces) by one degree Fahrenheit. Since BTUs are measurements of energy consumption, they can be converted directly to kilowatt-hours (3412 BTUs =1 kWh) or joules (1 BTU =1,055.06 joules). A wooden kitchen match produce approximately1 BTU, and air conditioners for household use typically produce between5,000 and15,000 BTU.

MBTU stands for one million BTUs, which can also be expressed as one decatherm (10 therms). MBTU is occasionally used as a standard unit of measurement for natural gas and provides a convenient basis for comparing the energy content of various grades of natural gas and other fuels. One cubic foot of natural gas produces approximately1,000 BTUs, so1,000 cu.ft. of gas is comparable to1 MBTU. MBTU is occasionally expressed as MMBTU, which is intended to represent a thousand thousand BTUs.

MMBTU, or MBTU, stands for one million British Thermal Units (BTU). A BTU is a measure of the energy content in fuel, and is is used in the power, steam generation, heating and air conditioning industries. One BTU is equivalent to1.06 Joules.

MMBTU / MBTU, means One Million British Thermal Units (BTU).

For Natural Gas which is Calculated in MMSCFD; (One Million Standard Cubic Feet per Day)

MMSCF = MMBTU / Heat (Cal.) Value

I Nm3 =1 x. x Cal. Value (usually Cal Value of NG is between to)

Average1 Nm3 of NG is9 MMBTU.

Higher the calorific Value means higher the Presence of Heavy Hydrocarbons.

Thanks for the invitation Mr. sajeesh sivan Pillai 

Million Metric British Thermal Unit

it refers to Million British thermal Uint

As Sirs answers

Million Metric British Thermal Unit

mmbtu stands for one million british thermal unit. btu is a measure of the energy content in fuel.

1 mmbtu = 1,000,000 btu

in short btu is very small unit therefore we use mmbtu.

Thank you for the invitation, but I really don't know.