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Science Fiction
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"Science fiction writers, I am sorry to say, really do not know anything. We can't talk about science, because our knowledge of it is limited and unofficial, and usually our fiction is dreadful."
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![]() Diamagnetism has been known since the early 19th century; the first experimental confirmation of diamagnetic levitation was done with bismuth in 1939. The technique also works with living creatures; a living frog was successfully levitated when placed in the bore of a Bitter solenoid with a field strength of about 16 Tesla (the magnetic field strength of the Earth varies from about .3 to .6 gauss at sea level; one Tesla equals 10,000 gauss).
Diamagnetism occurs as a result of a magnetic field's interference with the motion of electrons orbiting the atoms or molecules of a material. When matter is placed in a magnetic field, the magnetic force acts upon the moving electrons in the matter, causing the electrons to be deflected. This movement of the electrons interferes with the motion of the magnetic field, so the atoms internally oppose the field. This causes the material to be slightly repelled by the magnetic field.
All materials demonstrate some degree of diamagnetism. Magnetic levitation occurs when the force on such an object is strong enough to balance the weight of the object itself. The technique of immersing an object in a liquid to enhance the diamagnetic effect is called "magneto-Archimedes" levitation, due to the buoyancy provided by the liquid. Comment/Join this discussion ( 3 ) | RSS/XML | Blog This | Additional
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Science Fiction
Timeline
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'the registration number which the traffic control automatically photographed as she left the controlway...'
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'...without burning a single hydrocarbon molecule to injure the diseased atmosphere any further.'
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'Bird-like robots now descended from the ceiling of the theatre...'
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'The efficient robot waiter of the Sky Club had cleared away the remnants of an epicurean meal.'
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'...in the tank the new body and the new mind and memory and life has taken almost instant form.'
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