To introduce students with visual impairments to the three states of matter by examining tactile models illustrating the characteristics of particles in each state
It is hard to imagine that matter is made of particles since no one can see them. In print textbooks, the diagrams used to demonstrate the phases of matter frequently look like round balls or marbles. The particles in a solid are shown in a grid with the particles very close together. In the picture representing a liquid, the balls have more space between each one, and for gases the balls are drawn with even more space between them. Sometimes the drawing includes arrows representing the movement of the particles. In this activity, marbles model the particles and their movement.