One way to figure this out is to put the object in a graduated cylinder containing water and measuring the changes in the volume of the water.
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By definition, an irregular object is one that does not have an easy mathematical representation, it is extremely difficult (if not impossible) to calculate its volume without placing it into a solution of some sort. Attempts to calculate volume otherwise would be subject to severe rounding error, and would thus make it unsuitable for scientific use. For the very special case where the object is uniform and/or its density, ρ=m/V, is known, then its volume could be determined from its mass, V=m/ρ.
Volume is how much cubic units could hold, and capacity is how much an object can hold a liquid.
A ruler: I have got one right next to me on my desk.
Typically, one would use a tape measure or ruler and find the dimensions of the object. The dimensions are reported in length x width x height.
This cannot be sensibly answered. A milliliter (mL or ml) is a measure of volume, kilograms is a measure of weight or mass.Millilitres, mL, are a measure of volume, whereas kilograms, kg, are a measure of mass.As such, the two cannot really be compared.However, one litre of weighs exactly one kilogram, so one could say that there are 1000 mL in 1 kg of water.