radiation pressure


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Radiation pressure

Pressure exerted by electromagnetic radiation on objects on which it impinges. This pressure is caused by the fact that electromagnetic radiation transmits energy and possesses momentum. These pressures are very small. The effect is conspicuous in the case of a comet near the Sun, where the radiation pressure from the Sun forces the lighter cometary constituents away from the Sun. See Electromagnetic radiation

radiation pressure

The very small pressure exerted on a surface by light or other electromagnetic radiation. The radiation is considered as a stream of photons, and the pressure is then due to the transfer of momentum from the photons to the surface. Although radiation pressure has a negligible effect on large particles or on dense matter, the effect is considerable with very small particles, which are driven away from the radiation source. Thus solar radiation pressure, aided by the solar wind, clears tiny particles of dust (< 1 μm) from the Solar System. See also Poynting–Robertson effect.

radiation pressure

[‚rād·ē′ā·shən ‚presh·ər]
(acoustics)
The average pressure exerted on a surface or interface between two media by a sound wave.
(electromagnetism)
The pressure exerted by electromagnetic radiation on objects on which it impinges.
References in periodicals archive ?
He solved these problems by invoking radiation pressure and the laws of thermal radiation.
Christine Demore, a physicist at the University of Dundee in Scotland, and colleagues set out to reverse the direction of that radiation pressure, so that an object would get pulled rather than pushed.
Because it may be tumbling along under atmospheric drag instead of solar radiation pressure, some purists insist it isn't a true solar sail.
Recent advances in technology mean that spacecraft propelled by solar sails, which use radiation pressure from photons emitted by the Sun, or electric sails, which harness the momentum of the solar wind, can now be envisaged for mid-term missions.
Until now, scientists weren't sure whether magnetic fields, radiation pressure, or heat alter the orbit and trigger that fall.
At the macroscopic scale, the interaction is mediated by the radiation pressure and is raising considerable interest as a way to excite and control mechanical oscillators, allowing, for instance, the refrigeration of a macroscopic object near the quantum limit.
This solar radiation pressure would have a negligible effect on normal-sized spacecraft but is significant at the millimetre scale.
The L-AII update has incorporated improvements in a variety of scientific knowledge areas, including: numerical standards, geopotential, monitor station site displacement, tidal variations in the earth's rotation, tropospheric delays, and satellite solar radiation pressure.
With atoms no longer in light's grip, radiation pressure stops, and the biggest sound waves quickly die.
This fine dust is usually removed through collisions among the particles, radiation pressure from the star's light and other forces," explained Debes.
The tug-of-war between gravity and radiation pressure generated acoustic oscillations, which are regions of higher and lower pressure that have the same form as sound waves.
The research, by Lawrence Livermore National Laboratory, University of California, Santa Cruz and UC Berkeley, has shown how a massive star can grow despite outward-flowing radiation pressure that exceeds the gravitational force pulling material inward.

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