Triple Point of Water, 4C50.40

Topic and Concept:

• Change of State, [:ChangeofState#CriticalPoint: 4C50. Critical Point]

Location:

• Cabinet: [:ThermoCabinet:Thermodynamics (TD)]

• Bay: [:ThermoCabinetBayA5:(A5)]

• Shelf: #2

attachment:TripplePointWater07-400.jpg

Abstract:

A sealed Erlenmeyer flask filled with ice water has the air pumped out of it creating a partial vacuum. Thus brings the mixture to the triple point of water whereupon the mixture boils showing solid, liquid, and gas existing at the same pressure and temperature.

Important Setup Notes:

• Ice is needed of this demonstration, witch may require extra setup time.

Setup and Procedure:

1. Pull out and plug in the Vacuum Pump cart. See [:VacuumPump: Vacuum Pump] page for operational instructions.

2. Add about an inch worth of ice to either flask.
3. Add just enough water to the flask to cover the ice.
4. Firmly push on the stopper with the vent tube to seal the flask.
5. Place the vacuum hose onto the vent tube.
6. Turn on the vacuum pump.

Cautions, Warnings, or Safety Concerns:

• N/A

Discussion:

Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate.

Videos:

• [https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]

References:

• [https://en.wikipedia.org/wiki/Tripple_point Wikipedia - Triple Point]

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