In general you cannot.
A cubic metre is a measure of volume, whereas a square metre is a measure of area. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is not valid.
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Cubic meters and square meters aren't even the same kind of quantity.
A cubic meter is one square meter on each side of a cube. Think of a box which is one meter long on each side. A square meter has no height, so you can't really say how many square meters are in a cubic meters.
You cannot. Cubic meters measure volume and square meters measure area. They are not the same thing.
5 cm = 0.05 meter0.072 cubic meter / 0.05 meter = 1.44 square meter
A 28 meter square is 28 times 28 meters or 784 square meters. If it is one tenth of a meter (10 cm) deep, it has a volume of 78.4 cubic metersIf you mean 28 square meters (like a pool 4 meters by 7 meters) then the volume one tenth of a meter deep is 2.8 cubic meters.