#  Temperature and Thermal Properties of Matter 

 



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###  Ideal Gas Thermometer

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Constant volume mercury manometer with helium filled bulb; temperature measured by change of mercury head.

###  Triple Point of Water

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A triple point cell used to define the Kelvin scale such that the triple point of water is exactly 273.16 K.

###  Thermal Expansion

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Brass ball doesn't fit through brass ring until ring is heated.  
  
\[[In-Depth Description](/presentations/thermal-expansion)\]

###  Shrinking Rubber Band

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Unlike most materials, the demonstration shows that rubber *contracts* when heated.

###  Heat Capacity

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A hot copper cylinder is placed into a water bath; temperature and mass measurements yield the heat capacity of the copper cylinder.

###  Supercooling of Water

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Pure water cooled to below 273K without freezing; seeded to spontaneously crystallize.  
  
\[[In-Depth Description](/presentations/supercooling-water)\]

###  Heat of Evaporation (not available)

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Room temperature freon cools surface below 273K by evaporation.

###  Dippy Duck

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Evaporation of water on duck's head cools vapor inside causing low pressure, etc.  
  
\[[In-Depth Description](/presentations/dippy-duck)\]

###  Cloud in a Bottle

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A 5-gallon bottle containing air and water vapor is slightly pressurized; a sudden release of the pressure cools the vapor, forming a cloud.

 \[[In-Depth Description](/presentations/cloud-bottle)\]

###  Liquid Nitrogen Trash Can

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An inverted trash can is launched into the air by an exploding bottle of liquid nitrogen.  
  
\[[In-Depth Description](/presentations/liquid-nitrogen-trash-can)\]

###  Ice Bomb

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Metal sphere encases water; when sphere is placed on dry ice, water freezes and expands, with explosive results.

###  Change of Volume with State

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CO2 and He balloons in liquid nitrogen.  
  
\[[In-Depth Description](/presentations/change-volume-state)\]

###  Sublimination of CO2

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Solid dry ice turns directly into gaseous state.

###  Solid, Liquid, Gaseous CO2

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Observation of phase changes with corresponding pressure changes.

 \[[In-depth description](/presentations/solid-liquid-gaseous-co2)\]

###  PVT Surfaces

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Three-dimensional plaster model of PVT relationships.  
  
\[[In-Depth Description](/presentations/pvt-surfaces)\]

###  Boiling/Freezing of Water in a Vacuum

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Room temperature water boils in an evacuated bell jar and then freezes due to rapid surface evaporation.

 \[[In-depth description](/presentations/boilingfreezing-water-vacuum)\]

###  Boil Water with Ice Water

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Hot water in a sealed flask is plunged into an ice water bath and starts to boil.

###  BCC to FCC

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The microcystaline structure of a steel wire changes from body-centered-cubic to face-centered-cubic as it is heated to red-hot.  
  
\[[In-Depth Description](/presentations/bcc-fcc)\]

###  Critical Opalescence

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Binary fluid mixture becomes opalescent when heated up to its critical temperature ... the fluids become miscible above this temperature.  
  
\[[In-Depth Description](/presentations/critical-opalescence)\]

###  Contact Us

 **Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu