Melting Point, Boiling Point and State of Matter



  1. The physical state of a substance at a certain temperature and pressure depends on the values of its melting and boiling points. 
  2. A substance is in solid state if it exists at a temperature below its melting point.
  3. A substance is in liquid state if it exists at a temperature above its melting point but below its boiling point.
  4. A substance is in gaseous state if it exists at a temperature above its boiling point.