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Heat

When heated, most matter contractsparticlesexpandsbounceSelect your answer, or gets larger. This is why basketballs bounceparticlescontractsflatSelect your answer much higher on hot days. Most matter shrinks, or contractsexpandsbouncespaceSelect your answer, when cooled. This is why your bicycle tires might appear flatenergyexpandsbounceSelect your answer on a cold day. The spaceparticlesenergybounceSelect your answer making up matter are constantly colliding with one another. The particles move faster as more spaceenergyparticlesbounceSelect your answer is added. This makes the particles bounce off each other with more energy. Since the particles collide with more energy, they need more bouncecontractsspaceexpandsSelect your answer. This makes matter expand.