First of all, the word normal is redundant since all cubic metres are normal. There is, however, no conversion possible.
A kilogram is a measure of mass. A cubic metre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a cubic metre of air. How many kilograms? Next consider a cubic metre of lead. How many kilograms?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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How to convert Cubic meter to BTU
Grams are a measure of weight, a square meter is a measure of area, and a cubic meter is a measure of volume. These are not comparable.
Pounds per cubic foot x 16.0184634 = kg/m3
To convert cubic meters of asphalt to tons, you need to know the density of the asphalt, which typically ranges from about 2,200 to 2,400 kg/m³. Multiply the volume in cubic meters by the density to get the mass in kilograms, then divide by 1,000 to convert to tons. For example, if the density is 2,300 kg/m³, then 1 cubic meter of asphalt would equal approximately 2.3 tons.
"The density is 3,000 kg per cubic meter." That tells you that every cubic meter of it has 3,000 kg of mass.There are 6 cubic meters in 6 cubic meters.Each cubic meter has 3,000 kg of mass.So in 6 cubic meters, there are (6 x 3,000) = 18,000 kgof mass