Matter is anything that takes up space. Physical property is anything you can observe about an object by using your senses. Solids take up a specific amount of space and have a definite shape. A liquid has a volume that stays the same, but it can change its shape. A liquid takes the shape of any container it is put into. A gas does not have a definite shape or a define volume. It takes up all the space in its container. Matter is made of atoms. Atoms are the basic building blocks of matter. Adding heat or taking heat away causes matter to change states. This is because adding heat makes the particles in matter move faster. Evaporation is the process by which a liquid becomes a gas. All matter takes up space. The amount of space matter takes up is called its volume. Mass is the amount of matter in an object. You can’t tell how much mass an object has if you just look at it. You have to measure to find out how much mass an object has. Weight and mass are different. Mass is the measure of the amount of matter in an object. Weight is the measure of the force of gravity on an object An object’s mass stays the same no matter where the measurement is taken. An astronaut’s mass would be the same on the moon as it would on Earth. An astronaut’s weight on the moon would be 1/6 of what he or she weighs on Earth. Using the right tools makes measuring easy. Measures mass Measures volume Measures volume Measures mass Different kinds of matter can take up the same amount of space but have different masses. A lime has about the same volume as an egg. But the lime has more mass.