You cannot equate the two units.
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You cannot. The first is the measure of volume, the second of mass. A cubic metre of air would have a much smaller mass (fewer kilograms) than a cubic metre of lead.
The only way to solve this is to identify the substance being measured. For example, exactly one cubic meter of pure water at sea level, at a temperature of 3.98 °C (its densest) masses exactly 1,000 kilograms, or one metric tonne. (In fact, this is the very definition of a metric tonne.)
mass = volume x density. The units, of course, have to be compatible - for example, if the volume is in cubic meters, and the density in kilograms per cubic meter, the mass will naturally be in kilograms.
To convert cubic meters (m^3) to kilograms (kg), you need to know the density of the substance in question. The formula for this conversion is: mass (kg) = volume (m^3) x density (kg/m^3). So, if you have the density of the substance, you can multiply the volume in cubic meters by the density to get the mass in kilograms.
Metres is weight. Kilograms is mass.