When materials cool down, their kinetic energy decreases. As this happens, the particles move less and become more packed together. This causes the material to contract.
When materials warm up, their kinetic energy increases. As this happens, the particles move more and become less packed together. This causes the material to expand.
A conductor is a material that can allow heat or electricity to pass through it. Metals are good conductors.
When materials cool down, their kinetic energy ________________ (increases/decreases). As this happens, the particles move ___________ (more/less) and become more packed together. This causes the material to _______________ (contract/expand).
When materials warm up, their kinetic energy ________________ (increases/decreases). As this happens, the particles move ___________ (more/less) and become less packed together. This causes the material to _______________ (contract/expand).
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