The document discusses the different states of matter - solids, liquids, and gases. It summarizes their key properties: 1) Solids have a definite shape and volume, and molecules are closely packed and cannot move freely. 2) Liquids have a definite volume but no definite shape as they take the shape of their container, and molecules can move freely within their volume. 3) Gases have no definite shape or volume as molecules are completely free to move anywhere.