to figure out how much space is in an object
volume
You weigh it.
volume
volume
density
You would use a graduated cylinder
liters and millimeters
graduated cylinder and a cylinder
They would use density to measure the volume of a substance :)
Displacement is the process used to find the volume of an irregular object. This is done by submerging the object in water and measuring either the height the water rises or the volume of water that overflows the container.
The units used in science include .length-meters, mass-grams, volume-liters
Most scientist now use the Celsius scale.