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virtual particle
subject			fact

virtual particle	has definition A particle that exists for an extremely short time in an intermediate stage of a reaction or transition.
	has definition Particles which take part in virtual processes. They are said to be "off mass-shell", meaning that the relation E2 = p2c2 + m02 c4 does not hold.
	has definition Particles that erupt from the vacuum momentarily; they exist on borrowed energy, consistent with the uncertainty principle, and rapidly annihilate, thereby repaying the energy loan.
	has definition Quantum uncertainties in energy make it possible for virtual particles to be constantly created and annihilated during elementary particle interactions. Elementary particles are able to make use of these virtual particles within their interactions.
	is a kind of particle
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of virtual particle :

• virtual pair (2 facts) - Particle and antiparticle that exist for an extremely short time, often as the intermediate stage of a nuclear transition. According to Dirac's theory, the vacuum can be visualized as consisting of a sea of virtual electron-positron pairs that can only be released or separated when sufficient energy is made available.

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