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In physics, the Casimir effect and the Casimir-Polder force are physical forces arising from a quantized field. The typical example is of two uncharged metallic plates in a vacuum, placed a few micrometers apart, without any external electromagnetic field. In a classical description, the lack of an external field also means that there is no field between the plates, and no force would be measured between them. When this field is instead studied using quantum electrodynamics, it is seen that the plates do affect the virtual photons which constitute the field, and generate a net force[1]—either an attraction or a repulsion depending on the specific arrangement of the two plates. This force has been measured, and is a striking example of an effect purely due to second quantization. [2][3] (However, the treatment of boundary conditions in these calculations has led to some controversy.[4])
Dutch physicists Hendrik B. G. Casimir and Dirk Polder first proposed the existence of the force and formulated an experiment to detect it in 1948 while participating in research at Philips Research Labs. The classic form of the experiment, described above, successfully demonstrated the force to within 15% of the value predicted by the theory.[5]
Because the strength of the force falls off rapidly with distance, it is only measurable when the distance between the objects is extremely small. On a submicrometre scale, this force becomes so strong that it becomes the dominant force between uncharged conductors. In fact, at separations of 10 nm—about 100 times the typical size of an atom—the Casimir effect produces the equivalent of 1 atmosphere of pressure (101.3 kPa), the precise value depending on surface geometry and other factors [1].
Although the Casimir effect can be expressed in terms of virtual particles interacting with the objects, it is best described and more easily calculated in terms of the zero-point energy of a quantized field in the intervening space between the objects. In modern theoretical physics, the Casimir effect plays an important role in the chiral bag model of the nucleon; and in applied physics, it is becoming increasingly important in the development of the ever-smaller, miniaturised components of emerging microtechnologies and nanotechnologies.
Originally posted by Revolution-2012
reply to post by theresult
Obviouslly John Hutchinson can make stuff float with it however he has an external energy source.
Originally posted by Revolution-2012
reply to post by Intothepitwego
That's nice.
=)
turns out that, on balance, the attractive components have a slightly stronger impact than the repulsive ones. For two perfect, plane, parallel mirrors the Casimir force is therefore attractive and the mirrors are pulled together. The force, F, is proportional to the cross-sectional area, A, of the mirrors and increases 16-fold every time the distance, d, between the mirrors is halved: F ~ A/d4. Apart from these geometrical quantities the force depends only on fundamental values - Planck's constant and the speed of light.
Originally posted by Revolution-2012
reply to post by Intothepitwego
As far as you go.
Proove to me that the twin towers weren't blown up by explosives.
Proove to me that UFOs don't fly off anti-gravity (maybe even similar to what John has produced)
And proove to me why I should care what you say because I've already reviewed every skeptic on John Hutchinson and found that they are as worthy of proof as he is.
Blah humbug.
On the other hand.
Good point other guy!
=)
Originally posted by Revolution-2012
reply to post by Intothepitwego
2) theres no visual evidence of any faking of the events.