How do you measure the volume of an action figure?

Well you mesure lengh time with or X or Y

I guess that by an "action figure" you mean a very irregular shape. So, get hold of a couple of measuring cylinders. Fill one to the brim with water. Carefully dunk the action figure (non absorbent, I hope) in the water and catch the spillage in another cylinder. The volume of water displaced is the same as the volume of the action figure, I hope. This idea is used in the "eureka can" experiment, and I think is attributed to the Great Archimedes (circa 2000 years ago). Very useful bloke when it comes to making sure that the phrase "cast iron sinks" isn't always true.

Biased means unfair but that's all ik

The rocks expand when there hot/warm  and contract when they are cold.