Put it in a container of water. The amount of water it displaces (or the amount the water level rises) is exactly equal to the volume. Behold: you're Archimedes.
answ2. For awkward materials such as pumice and sugar cubes, a suitable fluid is a fine granular material such as flour or Lycopodium powder.
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you cut it into regular solids then figure out those then add them together
The volumes of small irregular solids are usually easily measured by measuring the volume of fluid displaced when they are immersed in a liquid. For example: You would have to put the object in a measuring glass with water in it. (~1/3 filled) Put the object in it and then get the number from the measuring glass (beaker etc. mostly beaker) and that is how you measure a irregular solid!
To find the volume of an irregular object using a graduated cylinder, you can use the method of water displacement. Fill the graduated cylinder with a known volume of water, then carefully submerge the irregular object in the water. The increase in water level corresponds to the volume of the object. Subtract the initial volume from the final volume to determine the volume of the irregular object.
Determine its mass using a balance and determine its volume using water displacement. Then divide the mass by the volume to get density. Refer to the related link below for more detail.
The displacement method is used to determine volume. However, if you know the density, the displacement test can give volume, which is used to work out mass by the formula m = dV