What is mass? How can we measure it? In Mass, beginning readers learn about mass and matter and how they apply to their everyday lives. Vibrant, full-color photos and simple diagrams complement carefully leveled text to engage young readers as they learn about these fundamental physical science concepts. A hands-on STEM activity invites readers to experiment and compare the mass of an inflated and deflated balloon. Children can learn more about states of matter and physical science concepts online using our safe search engine that provides relevant, age-appropriate websites. Mass also features reading tips for teachers and parents, a table of contents, picture glossary, and index. Mass is part of Jump's States of Matter series.