How to explain Conduction,Convection and Radiation

Heat flows.
liquid crystal thermal postcard shows conduction
Liquid Crystal thermometers

Liquid crystal thermometers portray temperatures as colors and can be used to follow temperature changes caused by heat flow. They can be used to observe that heat flows by conduction, convection, and radiation.
  • Liquid crystal thermometer
  • stopwatch
  • ruler
  • flat pieces of metal, about an inch wide and at least four inches long
  • adhesive to attach liquid crystal material to the metal pieces
  • lightbulb
  • hot and cold water in open top containers
  • a thermometer
Four explorations follow:
  1. How liquid crystal postcards work
  2. Conduction
  3. Convection
  4. Radiation.

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