by using the water displacement method of Archimedes.
For example,a stone's volume(an irregularly-shaped figure) can be measured by dropping it in a graduated cylinder with water(for example 20g water)...then the water will be displaced after you immersed the stone into it(it became 35g).the total displaced water(15g) will be the stone's volume..
this is the same with what happened to Archimedes when he was asked by a king to determine whether his crown was made of pure gold.
for more info,just read some books..lol!
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water displacement
Displacement method.... Is the method to find volume of an irregular object
Make a mold of the object and then fill the mold with water and measure the volume of the water.
Volume is the amount of cubic centimeters in an object. To find the volume of a regular shaped object multiply length x width x height. To find an irregular shaped objects volume put water in a container and measure the amount. Place the object in the water and measure the new volume. Subtract the old volume from the new volume and that's your answer. You would write as x cm3. Weight is gravity's pull on an object
It is a method called displacement. Displacement is a method that many scientists use. First you put a certain amount of water in a container (test tube, beaker). Second you Measure how many milliliters of water you put into it. Next you Add your irregular object into the water. Then you measure how many milliliters the water level rose. Then you subtract your second measurement with the irregular shaped object in it by your first measurement without the object in it and it will give you the volume of your irregular shape object.