A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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the problem of finding the path between two points such that the transit time under specified conditions is minimized.
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concerned with temperatures below 123 K (-150 deg C), widespread usage in gas liquefaction and storage, vacuum science and supercondcutivity
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a symmetry in nuclear physics under the interchange of neutrons and protons. The strong nuclear force conserves isospin, but the symmetry is broken by the electromagnetic force, which only …
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a hypothetical form of radioactive decay in which the proton decays into lighter subatomic particles. There is currently no experimental evidence that proton decay.
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The average length that a molecule will travel in a fluid before colliding with another molecule.
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an electrical appliance using the principles of a motor.
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the distance over which significant charge separation can occur in a conductive material or plasma due to a variety of effects.
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the electromagnetic shock-wave due to a charged particle traveling through a medium faster than the speed of light in that medium.
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