Item number: 245
Physical phenomenons Dimensions: 60 cm x 121 cm x 60 cm

Turn on the lamp and watch what happens. Why is the impeller now turning in the glass ball?

1.500 €

Further informations

on the exhibit "Lightmill"

Each wing of the wheel has a black and a bright surface. The incident light heat radiation only heats the dark surfaces. The air molecules generate a higher pressure at this point, which leads to the rotation of the impeller.

This phenomenon was discovered in 1874 by the English physicist Sir William Crookes and has since been called the "Crookes' light mill".

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Purchase price 1.500 €