you need
  • - scales,
  • - calculator,
  • - reference book on physics.
Guide
1
Weigh the test substance.It must be perfectly homogeneous because different substances have unequal density.This statement also applies to the same type of material but with varying humidity.If the dry mix with the wet sand, its density does not match the table value, because the density of wet and dry sand differs almost 1.3 times.
2
Locate the directory on the physics of the density of the substance.Since the density depends on external factors, in reference to a specified temperature, humidity and pressure of true value.To this one should pay attention: a cubic meter o
f wet board is twice as heavy as the same amount of dry lumber.
3
divide the value of the mass of matter in the value of its density from the directory.The obtained quotient is the volume that holds the test substance.