• A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.
  • Melting ice and grinding wood into sawdust are examples of physical changes.
  • When salt is dissolved into water, the salt is said to have entered the aqueous state.
  • The salt may be regained by boiling off the water, leaving the salt behind.
  • When a piece of wood is ground into saw dust, that change is irreversible since the sawdust could not be reconstituted into the same piece of Wood that it was before.
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