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[:PiraScheme#Thermodynamics: Table of Thermodynamics Demonstration] |
[:TDEquipmentList: Thermodynamics Equipment List] |
[:Demonstrations:Lecture Demonstrations] |
Leydenfrost Phenomenon, 4B50.30
Topic and Concept:
Heat and the First Law, [:FirstLaw#HeatTransferApp: 4B50. Heat Transfer Applications]
Location:
Cabinet: [:ThermoCabinet:Thermodynamics (TD)]
Bay: [:ThermoCabinetBayA1:(A1)]
Shelf: #1,2,3..
attachment:LeydenfrostPhenomenon01-400.jpg
Abstract:
Drop water on a hot plate and liquid nitrogen on the lecture table.
Equipment |
Location |
ID Number |
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|
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Dropper |
[:ThermoCabinetBayB1: TD, Bay B1, Shelf #2] |
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0.5 L liquid nitrogen |
[:ThermoCabinetBayB1: TD, Bay B1, Shelf #2] |
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Hotplate |
[:ThermoCabinetBayA5: TD, Bay A5, Shelf #2] |
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250 mL of water |
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Important Setup Notes:
This demonstration requires about 250 mL - 500 mL of liquid nitrogen.
Setup and Procedure:
- Plug in the hotplate and turn in on. It takes a few minutes to heat up.
- Using the dropper, drop several drops on the hotplate.
- Pour the liquid nitrogen on the table top and compare the behavior of the two fluids.
Cautions, Warnings, or Safety Concerns:
- Exercise caution throughout this demonstration. The hotplate can cause BURNS, and the liquid nitrogen can cause SEVERE FROSTBITE!
Discussion:
Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate.
attachment:LeydenfrostPhenomenon02-250.jpg |
attachment:LeydenfrostPhenomenon03-250.jpg |
attachment:LeydenfrostPhenomenon04-250.jpg |
attachment:LeydenfrostPhenomenon05-250.jpg |
Videos:
[https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]
References:
[https://en.wikipedia.org/wiki/Phase_transition Wikipedia -Phase Transition]
[https://en.wikipedia.org/wiki/Leidenfrost_effect Wikipedia - Leidenfrost Effect]
[:Instructional:Home]