A tonne is a measure of weight
A cubic meter is a measure of volume
There is no direct conversion.
They are related by the density of the substance, the greater the density, the smaller 1 tonne will take up, for example 1 tonne of Hydrogen takes about 11000 m3 whereas 1 tonne of Mercury takes about 0.074 m3.
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That depends on the substance density. Cubic feet is a measure of volume. Metric tonne is a unit of weight.