Final answer:
When a substance heats up, the particles move faster.
Step-by-step explanation:
When a substance heats up, the particles move faster. As temperature increases, the kinetic energy of the particles also increases. This causes the particles to vibrate and move more quickly. For example, when ice is heated, it melts into water and the water molecules start to move faster as they gain energy from the heat.
Learn more about particle movement with heat