Levitation

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This article is about the scientific techniques of levitation. For the magic illusion, see Magic (illusion). For paranormal activity, see Levitation (paranormal). For other uses, see Levitation (disambiguation).
A cubical magnet levitating over a superconducting material (known as the Meissner effect)

Levitation (from Latin levitas "lightness")[1] is the process by which an object is held aloft, without mechanical support, in a stable position.

Levitation is accomplished by providing an upward force that counteracts the downward force of gravity, plus a smaller stabilizing force that pushes the object toward a home position whenever it is a small distance away from that home position. The force can be a fundamental force such as magnetic or electrostatic, or it can be a reactive force such as optical, buoyant, aerodynamic, or hydrodynamic.[citation needed]

Levitation excludes floating at the surface of a liquid because the liquid provides direct mechanical support. Levitation excludes hovering flight by insects, hummingbirds, helicopters, rockets, and balloons because the object provides its own counter-gravity force.[citation needed]

Physics[edit]

Levitation (on Earth or any planetoid) requires an upward force that cancels out the weight of the object, so that the object does not fall (accelerate downward) or rise (accelerate upward). For positional stability, any small displacement of the levitating object must result in a small change in force in the opposite direction.[citation needed] The small changes in force can be accomplished by gradient field(s) or by active regulation. If the object is disturbed, it might oscillate around its final position, but it motions eventually decrease to zero due to damping effects. (In a turbulent flow, the object might oscillate indefinitely.)[citation needed]

Levitation techniques are useful tools in physics research. For example, levitation methods are useful for high-temperature melt property studies because they eliminate the problem of reaction with containers and allow deep undercooling of melts. The containerless conditions may be obtained by opposing gravity with a levitation force, or by allowing an entire experiment to freefall.[2]

Magnetic levitation[edit]

Main article: Magnetic levitation
a high-temperature superconductor levitating above magnet

Magnetic levitation is the most commonly seen and used form of levitation.

Diamagnetic materials are commonly used for demonstration purposes. In this case the returning force appears from the interaction with the screening currents. For example, a superconducting sample, which can be considered either as a perfect diamagnet or an ideally hard superconductor, easily levitates in an ambient external magnetic field. The superconductor is first heated strongly, then cooled with liquid nitrogen to levitate on top of a diamagnet. In very strong magnetic field, by means of diamagnetic levitation even small live animals have been levitated.

It is possible to levitate pyrolytic graphite by placing thin squares of it above four cube magnets with the north poles forming one diagonal and south poles forming the other diagonal.[3]

A magnetically levitated (maglev) train departing Pudong International Airport on the first commercial high-speed maglev line in the world.

Magnetic levitation is in development for use for transportation systems. For example the Maglev includes trains that are levitated by a large number of magnets. Due to the lack of friction on the guide rails, they are faster, quieter, and smoother than wheeled mass transit systems.

Electrodynamic suspension uses AC magnetic fields.

Electrostatic levitation[edit]

In electrostatic levitation an electric field is used to counteract gravitational force.

Aerodynamic levitation[edit]

In aerodynamic levitation, the levitation is achieved by floating the object on a stream of gas, either produced by the object or acting on the object. For example, a ping pong ball can be levitated with the stream of air from a vacuum cleaner set on 'blow'. With enough thrust, very large objects can be levitated using this method.

Gas film levitation[edit]

This technique enables the levitation of an object against gravitational force by floating it on a thin gas film formed by gas flow through a porous membrane. Melts can be kept clean and be supercooled.[2]

A common example is air hockey, where the puck is lifted by a thin layer of air.

Hovercraft produce a large region of high-pressure air underneath them.

Acoustic levitation[edit]

Main article: Acoustic levitation

Acoustic levitation uses sound waves to provide a levitating force.

Optical levitation[edit]

Main article: Optical levitation

Optical levitation is a technique in which a material is levitated against the downward force of gravity by an upward force stemming from photon momentum transfer (radiation pressure).

Buoyant levitation[edit]

Gases at high pressure can have a density exceeding that of some solids. Thus they can be used to levitate solid objects through buoyancy.[4] Noble gases are preferred for their non-reactivity. Xenon is the densest non-radioactive noble gas, at 5.894g/L. Xenon has been used to levitate polyethylene, at a pressure of 154atm.

Casimir force[edit]

Scientists have discovered a way of levitating ultra small objects by manipulating the so-called Casimir force, which normally causes objects to stick together due to forces predicted by quantum field theory. This is, however, only possible for micro-objects.[5][6]

Uses[edit]

Maglev trains[edit]

Main article: Maglev

Magnetic levitation is used to suspend trains without touching the track. This permits very high speeds, and greatly reduces the maintenance requirements for tracks and vehicles, as little wear then occurs. This also means there is no friction, so the only force acting against it is air resistance.

Animal levitation[edit]

Diamagnetic levitation of a live frog.

Scientists have levitated frogs,[7] grasshoppers, and mice by means of powerful electromagnets utilizing superconductors, producing diamagnetic repulsion of body water. The mice acted confused at first, but adapted to the levitation after approximately four hours, suffering no immediate ill effects.[8][9]

Further reading[edit]

  • Charles P. Strehlow, M. C. Sullivan (2008). "A Classroom Demonstration of Levitation...". arXiv:0803.3090..

See also[edit]

References[edit]

  1. ^ Levitate, "to rise by virtue of lightness," from Latin levitas "lightness," patterned in English on gravitate: Online Etymology Dictionary
  2. ^ a b Paul C. Nordine, J. K. Richard Weber, and Johan G. Abadie (2000), "Properties of high-temperature melts using levitation", Pure and Applied Chemistry 72: 2127–2136, doi:10.1351/pac200072112127 
  3. ^ Waldron, Robert D., "Diamagnetic Levitation Using Pyrolytic Graphite", Review of Scientific Instruments 37: 29–35, doi:10.1063/1.1719946 
  4. ^ http://www.mrs.org/s_mrs/sec_subscribe.asp?CID=12048&DID=275340&action=detail Materials Processing Through Levitation in High Gas Pressure
  5. ^ Scientists reveal secret of levitation, Yahoo! News
  6. ^ Levitation in Miniature, Null Hypothesis
  7. ^ "Frogs Levitate in a strong enough magnetic field". physics.org. Retrieved 20 November 2014. 
  8. ^ "NASA Levitates a Mouse With Magnetic Fields". Popular Science. September 9, 2009. Retrieved 20 November 2014. 
  9. ^ [1] Mice Levitated in Lab

External links[edit]

The dictionary definition of levitation at Wiktionary