• Water can be boiled in a vacuum chamber while a digital thermometer shows that the water temperature remains unchanged.
  • A video camera may be needed to display the temperature in a large classroom.
  • Please keep this demonstration brief so that vacuum pump does not become saturated with water.
  • Wear face shield while chamber is evacuated.

         (inspect bell jar)
         (fill 250 ml erlenmeyer flask to 150 ml)
         (use water slightly above room temperature to show that thermometer works)
         (put bell jar in box for transport)