• A Radiometer is a freely rotating 4-vaned
    propeller inserted in a vacuum in a light bulbshaped
    jar. Developed to measure the intensity
    of radiant energy or heat, the radiometer will
    help you understand the principle of energy
    conversion and show how heat and mechanical
    energy are products of energy conversion. The
    opposite side of each vane of the propeller is
    coated with white and black color. As the light
    hits the radiometer, the lightened side reflects
    the light while the darkened side absorbs it. As
    the darkened side absorbs the radiant energy,
    a difference in temperature develops between
    the vanes. Since the temperature of the gas
    molecules between the vanes are closer to the
    blackened part, the molecules start to move
    faster. These freely moving gas molecules
    bounce off the darkened side with a great deal
    of energy. So it starts to rotate.
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  • Dimensions: 50x60x160cm
    (Width x Length x Height)