Boiling At Reduced Pressure
To demonstrate that water boils at a lower temperature under reduced pressure.
Flask with water inside plastic liner, hot plate, dry ice and gloves.
Handle with care. Be sure stopper is loose when heating the water.
15 min. (Dry ice must be obtained from Chemistry.)
Water is boiled in the flask, then heat is removed and the flask is sealed after boiling ceases. Dry ice is packed around the flask, reducing the pressure inside the flask. The boiling immediately resumes.