The Emission of Thermal Radiation

In this experiment I demonstrate how the colour of a hot object affects the amount of thermal radiation emitted by that object.
The two flasks are identical in all ways except for their colour. They are both filled with equal quantities of hot water at the same temperature.
The main way in which the flasks lose heat is through the processes of conduction and convection, but the black flask also loses an appreciable amount of heat due the emission of thermal radiation, as can be seen by comparing its temperature to that of the shiny flask.

[@MichaelDreksler]

Despite knowing about this experiment forever, I have never actually done it or seen it done. Thank you

[@marianl8718]

This experiment can also be done by painting a vessel half silver and half black and placing thermometers with the tank painted black on each side of the vessel. Instead of thermometers, black-painted thermistors could be used in a Wheatstone circuit. The imbalance would be seen immediately.

[@learning-pe9ww]

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[@princesoni7241]

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