Info

The spinning radiometer used in 4B40.1 Radiation of Heat does not demonstrate radiation pressure, as often thought. Shining a flashlight on it will push the black sides of the vanes, rather than the reflective sides, indicating that the spinning is due to heating and expanding the very small amount of gas inside, and not due to momentum transfer of photons. The effect of radiation pressure is many orders of magnitude smaller and requires a much more sensitive measuring device to detect.

Parts List

Radiometer in D. Thermo, 1B

Light Source in D. Thermo, 1B or L. Misc

Relevant Simulation

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Other Information

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Real-Life Examples

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More Advanced Reading

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