One is a unit of volume, the other a unit of mass. There is no standard conversion between them. You can do the conversion for specific substances, if you know the substance's density: volume = mass / density.
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0.4 m3 equals (0.4*10^3) dm3, which equals (0.4*10^6) cm3 = 400 000 cm3 ~NajN
density = mass ÷ volume = 4 g ÷ 6 cm3 = 2/3 g/cm3
aprox 21.04 tons
12,000,000,000,000,000 lbs
42 mL = 42 cm3