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Radiation pressure facts for kids

Kids Encyclopedia Facts

Radiation pressure is the pressure exerted upon any surface exposed to electromagnetic radiation. If absorbed, the pressure is the energy flux density divided by the speed of light. If the radiation is totally reflected, the radiation pressure is doubled. This happens because the waves that make up electromagnetic radiation carry momentum with them and pass that momentum on when they reach a surface.

For example, the radiation of the Sun at the Earth has an energy flux density of 1370 W/m2, so the radiation pressure is 4.6 µPa (absorbed).

  • Demir, Dilek,"A table-top demonstration of radiation pressure",2011, Diplomathesis, E-Theses univie (http://othes.univie.ac.at/16381/)

Images for kids

  • Sail-Force1

    Force on a reflector results from reflecting the photon flux

  • Cavity Optomechanics

    In this optomechanical cavity, light is trapped and enhanced between two mirrors. One of the mirrors is attached to a spring and can move. The radiation pressure force of the light circulating in the cavity can damp or amplify the oscillation of the mirror on the spring.

See also

Kids robot.svg In Spanish: Presión de radiación para niños

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