![]() That includes, but is not limited to, biomicroscopy (where light is used to irradiate and observe microbes, cells, and molecules), quantum optics, and optomechanics (where light is used to probe and control objects like atoms, qubits and macroscopic quantum objects). Radiation pressure forces are the bedrock of laser technology and the branches of science that rely heavily on lasers and other optical technologies. ![]() Furthermore, large lasers operating in space have been suggested as a means of propelling sail craft in beam-powered propulsion. The significance of radiation pressure increases rapidly at extremely high temperatures and can sometimes dwarf the usual gas pressure, for instance, in stellar interiors and thermonuclear weapons. Radiation pressure from starlight is crucial in a number of astrophysical processes as well. For example, had the effects of the Sun's radiation pressure on the spacecraft of the Viking program been ignored, the spacecraft would have missed Mars orbit by about 15,000 km (9,300 mi). This particularly includes objects in outer space, where it is usually the main force acting on objects besides gravity, and where the net effect of a tiny force may have a large cumulative effect over long periods of time. ![]() The forces generated by radiation pressure are generally too small to be noticed under everyday circumstances however, they are important in some physical processes and technologies. The associated force is called the radiation pressure force, or sometimes just the force of light. black-body radiation) by matter on any scale (from macroscopic objects to dust particles to gas molecules). This includes the momentum of light or electromagnetic radiation of any wavelength that is absorbed, reflected, or otherwise emitted (e.g. Radiation pressure (also known as light pressure) is the mechanical pressure exerted upon any surface due to the exchange of momentum between the object and the electromagnetic field. Pressure exerted upon any surface exposed to electromagnetic radiation Force on a reflector results from reflecting the photon flux
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