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| Insert succinct description of demonstration. | 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. |
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| ||Vacuum Pump with Air Hose||[:MechanicsCabinet#MEFloorItems: Floor item South Wall (ME)]|| || | ||[:VacuumPump: Vacuum Pump]||[:MechanicsCabinet#MEFloorItems: Floor item South Wall (ME)]|| || |
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| * N/A | * '''''Ice is needed of this demonstration, witch may require extra setup time.''''' |
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| 1. List steps for setup then procedure. 1. ... |
1. Pull out and plug in the Vacuum Pump cart. See [:VacuumPump: Vacuum Pump] page for operational instructions. 1. Add about an inch worth of ice to either flask. 1. Add just enough water to the flask to cover the ice. 1. Firmly push on the stopper with the vent tube to seal the flask. 1. Place the vacuum hose onto the vent tube. 1. Turn on the vacuum pump. |
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| Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate. | attachment:h2o_phase_diagram_-_color.v2-400.jpg Matter exists in different phases depending upon its pressure and temperature. The specifics depend on which substance we're considering. The combinations of temperature and pressure that lead to a given phase of matter can be summarized in a phase diagram. Such a diagram for water is shown above. There exists one particular combination of temperature and pressure that allows water to exist as a solid, liquid, and gas simultaneously. This is called the triple point and for water this pressure and temperature are 612 Pa and 0°C. Adding ice to the water brings the ice water mixture into a dual phase state at 0°C. Using the vacuum pump, we pump out air from the flask which causes the internal pressure to drop. Upon reaching a pressure of 612 Pa, we see the ice water boil. |
[:PiraScheme#Thermodynamics: Table of Thermodynamics Demonstration] |
[:TDEquipmentList: Thermodynamics Equipment List] |
[:Demonstrations:Lecture Demonstrations] |
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.
Equipment |
Location |
ID Number |
|
|
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Erlenmeyer Flask with Holed Stopper |
[:ThermoCabinetBayA5: TD, Bay A5, Shelf #2] |
|
[:VacuumPump: Vacuum Pump] |
[:MechanicsCabinet#MEFloorItems: Floor item South Wall (ME)] |
|
Ice |
Lecture demo Freezer or 4rd floor ice chess room4329 |
|
Important Setup Notes:
Ice is needed of this demonstration, witch may require extra setup time.
Setup and Procedure:
Pull out and plug in the Vacuum Pump cart. See [:VacuumPump: Vacuum Pump] page for operational instructions.
- Add about an inch worth of ice to either flask.
- Add just enough water to the flask to cover the ice.
- Firmly push on the stopper with the vent tube to seal the flask.
- Place the vacuum hose onto the vent tube.
- Turn on the vacuum pump.
Cautions, Warnings, or Safety Concerns:
- N/A
Discussion:
attachment:h2o_phase_diagram_-_color.v2-400.jpg
Matter exists in different phases depending upon its pressure and temperature. The specifics depend on which substance we're considering. The combinations of temperature and pressure that lead to a given phase of matter can be summarized in a phase diagram. Such a diagram for water is shown above. There exists one particular combination of temperature and pressure that allows water to exist as a solid, liquid, and gas simultaneously. This is called the triple point and for water this pressure and temperature are 612 Pa and 0°C. Adding ice to the water brings the ice water mixture into a dual phase state at 0°C. Using the vacuum pump, we pump out air from the flask which causes the internal pressure to drop. Upon reaching a pressure of 612 Pa, we see the ice water boil.
attachment:TripplePointWater01-250.jpg |
attachment:TripplePointWater02-250.jpg |
attachment:TripplePointWater03-250.jpg |
attachment:TripplePointWater04-250.jpg |
attachment:TripplePointWater05-250.jpg |
attachment:TripplePointWater06-250.jpg |
attachment:TripplePointWater08-250.jpg |
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]
[:Instructional:Home]