Btu and cubic meter are two different measuring units.
Btu is the unit for heat transmission, like in ac units 12000 btu/hr. It means this ac unit would remove 12000 btu of heat from the room in one hour. where as cubic meter is the unit for volume.
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There are 1000 liters in one cubic meter.
The "BTU" is a unit of energy. The "MM BTU" is a million of them ... still a quantity of energy. The "cubic meter" is a unit of volume. BTU and "cubic meter" are used to measure completely different things. They have different physical dimensions, and neither one can be directly converted into the other one. You often find them appearing together, though, because if you have some 'volume' of a gaseous fuel, such as hydrogen or methane, and you know the pressure, then you can calculate how many BTU of energy you can get out of it by burning it. If the questioner will name the substance that fills the volume ... and also tell us its pressure ... then it's possible to begin calculating the quantity of energy available when the substance is burned.
There are approximately 61,024 cubic inches in one cubic meter. This can be calculated by knowing that one cubic meter is equal to 1,000,000 cubic centimeters, and one cubic inch is approximately 16.387 cubic centimeters.
one thousandth cubic meter (1 cubic meter = 1000 cubic liter)
1 cubic meter = 264.172052 US gallons.