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| ||<:30%>[:PiraScheme#Thermodynamics: Table of Thermodynamics Demonstration]||<:30%>[:TDEquipmentList: Thermodynamics Equipment List]||<:30%>[:Demonstrations:Lecture Demonstrations]|| | ||<:30%>[[PiraScheme#Thermodynamics| Table of Thermodynamics Demonstration]]||<:30%>[[TDEquipmentList| Thermodynamics Equipment List]]||<:30%>[[Demonstrations|Lecture Demonstrations]]|| |
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| Change of State, [:ChangeofState#CriticalPoint: 4C50. Critical Point] | Change of State, [[ChangeofState#CriticalPoint| 4C50. Critical Point]] |
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| * '''Cabinet:''' [:ThermoCabinet:Thermodynamics (TD)] * '''Bay:''' [:ThermoCabinetBayA5:(A5)] |
* '''Cabinet:''' [[ThermoCabinet|Thermodynamics (TD)]] * '''Bay:''' [[ThermoCabinetBayA5|(A5)]] |
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| attachment:TripplePointWater07-400.jpg | {{attachment:TripplePointWater07-400.jpg}} |
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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)]|| || |
||Erlenmeyer Flask with Holed Stopper||[[ThermoCabinetBayA5| TD, Bay A5, Shelf #2]]|| || ||[[VacuumPump| Vacuum Pump]]||[[MechanicsCabinet#MEFloorItems| Floor item South Wall (ME)]]|| || |
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| 1. Pull out and plug in the Vacuum Pump cart. See [:VacuumPump: Vacuum Pump] page for operational instructions. | 1. Pull out and plug in the Vacuum Pump cart. See [[VacuumPump| Vacuum Pump]] page for operational instructions. |
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||{{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}}|| |
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| * [https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel] | * [[https://www.youtube.com/user/LectureDemostrations/videos?view=1|Lecture Demonstration's Youtube Channel]] |
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| * [https://en.wikipedia.org/wiki/Tripple_point Wikipedia - Triple Point] | * [[https://en.wikipedia.org/wiki/Tripple_point|Wikipedia - Triple Point]] |
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| [:Instructional:Home] | [[Instructional|Home]] |
Triple Point of Water, 4C50.40
Topic and Concept:
Change of State, 4C50. Critical Point
Location:
Cabinet: Thermodynamics (TD)
Bay: (A5)
Shelf: #2
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 |
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Ice |
Lecture demo Freezer or 4rd floor ice chess room4329 |
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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 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:
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.
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