This document discusses the properties of matter. It defines matter as anything that takes up space and has mass. Matter is made up of tiny particles too small to see. The three states of matter - solids, liquids, and gases - are described. Solids have a definite shape and volume, with particles packed closely together. Liquids have a definite volume that takes the shape of their container, with particles spread out but still touching. Gases have no definite volume, spreading to fill their container, with particles spread far apart and moving freely. Methods for measuring the volume of solids, liquids, and irregular shapes are provided.