• A change of state occurs whenever matter changes from one state to another.
  • Common states of matter on Earth are solid, liquid, and gas.
  • Matter may change back and forth between any two of these states.
  • Processes involved in changes of state include melting, freezing, sublimation, deposition, condensation, and evaporation.
  • Energy is the ability to cause changes in matter, and it is always involved inChanges of state.
  • The Figure below shows how matter changes in each of these processes.
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