Leslie's cube, 4B40.30


(attachment photo showing the fully set up demonstration)


Heat radiation is demonstrated. Leslie's cube (named after Sir John Leslie who experimented with radiant heat in 1804) consists of a cubical vessel with different sides - one of brass, the other two painted black and white, and another side painted aluminum. When the cube is filled with hot water, the radiation is greatest from the black side, and negligible from the shiny side.



ID Number

Leslie's cube

TD, A4, Shelf #3


Thermopile horn

TD, A4, Shelf #3

Rock salt and various filters

TD, A4, Shelf #3

Hot water

Electric wires



  1. Make sure that you have enough hot water in the kettle.
  2. Connect the electric wires from the electrometer to the thermopile horn.
  3. Put the Leslie's cube on the revolving stand at one end of the table.
  4. Across the table, put the thermopole horn that connected with the electrometer and try to align the face of the horn to the side of the Leslie's cube.

Cautions, Warnings, or Safety Concerns:

  1. Beware of hot water.


A Leslie's cube has four different surface areas. One side is black, one is white, one is aluminum and the last one is brass. And each side demonstrates the different heat radiation. Pour hot water into the cube. A reading of the heat radiation from the surfaces is made by using a thermopile and an electrometer. You can show student that different surfaces can radiate the heat in different rate by using a thermopile and an electrometer. You can also show student by put another filter in between the thermopile and the cube to show variation.

Note: Hot water may be cooled up by the environment. So before showing another heat radiation from different side, you should use new hot water.

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  1. List any references

Heat and the First Law



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