Big Barometer - Demonstration

This demonstration shows the construction of of an eleven foot high barometer made with a concentrated solution of potassium tetraiodomercurate(II).

Barometer Shape

Barometers of different shapes all have the same level of mercury.

Vapor Pressure: Collapsing Balloon

Balloons are placed on the tops of two Erlenmeyer flasks, one containing boiling water and the other containing hot air. As the flasks cool, the balloon on the flask of water is drawn into the flask.