Find out the density (ρ) of the material constituting the physical body, the volume of which you want to calculate. Density is one of the two characteristics of the object involved in the calculation formula of the volume. If we are talking about real objects, the calculations used the average density as homogenous physical body in real conditions it is difficult to imagine. It must be unevenly distributed, at least microscopic voids or inclusions of foreign material. Keep in mind when defining this setting and the temperature - the higher it is, the less the density of the material, since heat increases the distance between its molecules.
The second parameter, which is needed to calculate volume - mass (m) of the body. This value will be determined, as a rule, the results of the interaction of the object with other objects or created their gravitational fields. This files most often have to deal with the mass, expressed through interaction with the Earth's gravity - the weight of the body. Ways to determine this value for relatively small objects simple - they just need to weigh.
To calculate the volume (V) of the body divide a certain in the second step, the parameter - weight - the parameter obtained in the first step - the density: V=m/ρ.
In practical calculations, to the calculations it is possible to use, for example, the calculator volume. It is convenient because does not require to look somewhere else the density of the desired material and enter it into a computer in the form there is a dropdown list with a list of the most frequently used in calculations of materials. Clicking the desired line, enter in the "Weight" weight, and in the "calculation Precision" set the number of decimal places that should be present in the calculations. The volume in liters and cubic meters you'll find in placed below the table. There just in case you will be given the radius of the sphere and the side of the cube, which should correspond to this volume of selected substances.