You cannot. Cubic meters are unit of volume, and kilograms are a unit of mass. The only exception is if you are talking about figuring out how heavy something is by its volume. Then you need to find its density, which will be in mass units/volume units. Then you just need to figure out how many of those volume units you have in the volume of the object you are working with, and multiply the mass units by that to get its mass.
However, you are able to convert m3 into kg for water quite simply.
1m3 of water = 1000kg of water
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You need to know the denisty measured in kg/m3. Then just divide kg/hr by the density to get m3/hr.
Not directly. A meter is a measure of length while a kilogram is a measure of mass. Although, you can work out the weight (kg) of a quantity of a substance by multiplying the volume of the substance (m3) by the density of the substance (kg/m3).
The density of oil is 820 kg/m3.
Density (kg/m3) = mass(kg)/volume(m3)= 0.386/20x10-3 = 19.333333....kg/m3
Indeterminate value! You can't convert from kg to m³ since kg measures mass while m³ measures volume. These units are thus incompatible to each other.