Boiling Water with an Ice Cube

Concept Overview:

Decrease in boiling point with decrease in pressure

Lecturer Procedure

Step(s) to Follow

1. Bring flask of water to a boil.
2. After the air has been pushed out (and only steam is coming out of flask), put stopper on and push it in tight.
3. Remove flask from heat and flip it over onto the stand. (see below for visualization)
4. Rub ice cube over bottom (now on top) of the flask.

Expected Result

Water will come back to a boil when ice is rubbed on the bottom due to the decrease in temperature.