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A volume would be expressed in cubic meters (m3), not in meters.
A metre cube of concrete is a volume of concrete which is equivalent to the volume of a cube each of whose sides are 1 metre long.
It depends on the density of the material, since tonnes are a unit of weight, and m3 is a unit of volume. Since density expresses the weight per unit of volume, you can divide the weight by the density to find the volume. If we happens to be dealing with 7460 tonnes of water (density 1 tonne/m3) then there will be 7460 m3.
Under standard conditions (25oC, 1atm), the density of air is about 1.168kg/m3. Hence 1kg of air would have a volume of: 1.168kg/m3 divided by 1kg = 0.8562m3
Water has a density of 1 that is (mass in kg/volume in m3=1) so mass in kg = volume in m3 2 x 3 x 1.5 = 3x3 = 9m3 which is 9kg