Jacob is learning to swim. He has arm bands on. The arm bands are blown up. They are full of air. The arm bands help Jacob to _____ in the water.

Learning about forces in science you have found out about stretchy materials. These can be used to make balloons. Balloons work by being filled with air or inflated. Other things work by being inflated. Tires and bouncy-castles are blown up with air. Have you ever blown bubbles? Bubbles are full of air, too.