You'll start this course by learning about matter. Matter is anything that has mass and takes up space, so every structure in your body consists of matter. You'll learn about the three main states of matter (solids, liquids, and gases), where they are in your body, and how they change from one state to another. You'll also learn about the particles that make up matter, the differences between elements and compounds, and physical and chemical characteristics of substances. The lesson will conclude with a discussion of surface tension and its effect on premature babies.