What is cavity?

  • (noun): A sizeable hole (usually in the ground).
    Synonyms: pit
    See also — Additional definitions below

Some articles on cavity:

Superconducting Radio Frequency - Physics of SRF Cavities
... the energy stored in, and Pd is the power dissipated in in the cavity to maintain the energy U ... The energy stored in the cavity is given by the integral of field energy density over its volume, , where H is the magnetic field in the cavity and μ0 is the permeability of free space ... in the above expressions are generally not solved analytically, since the cavity boundaries rarely lie along axes of common coordinate systems ...

More definitions of "cavity":

  • (noun): (anatomy) a natural hollow or sinus within the body.
    Synonyms: bodily cavity, cavum
  • (noun): Space that is surrounded by something.
    Synonyms: enclosed space