Length scale

In physics, length scale is a particular length or distance determined with the precision of one order (or a few orders) of magnitude. Different phenomena occur at different length scales. The typical lengths of all phenomena that occur at the same energy scale are comparable.

Related Topics:
Physics - Length - Distance

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The observation that different phenomena should be organized according to the length scale (or, equivalently, the energy scale) is one of the basic ideas of the renormalization group.

Related Topics:
Energy scale - Renormalization group

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For example, the QCD length scale is around 10^{-15} meters, and the "radii" of strongly interacting particles (such as the proton) are roughly comparable. The electroweak length scale is shorter, roughly 10^{-18} meters. The Planck length (Planck scale) is much shorter yet - about 10^{-35} meters.

Related Topics:
QCD - Proton - Electroweak - Planck length

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