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In physics, length scale is a particular length or distance determined with the precision of at most a few orders of magnitude.The concept of length scale is particularly important because physical phenomena of different length scales cannot affect each other [citation needed] [clarification needed] and are said to decouple.
Click on image for detailed view and links to other length scales. Scale model at megameters of the main Solar System bodies. To help compare different orders of magnitude, this section lists lengths starting at 10 8 meters (100 megameters or 100,000 kilometers or 62,150 miles). 102 Mm – diameter of HD 149026 b, an unusually dense Jovian planet
In particle physics and physical cosmology, the Planck scale is an energy scale around 1.22 × 10 28 eV (the Planck energy, corresponding to the energy equivalent of the Planck mass, 2.176 45 × 10 −8 kg) at which quantum effects of gravity become significant.
Particle physics, dealing with the smallest physical systems, is also known as high energy physics. Physics of larger length scales, including the macroscopic scale, is also known as low energy physics. Intuitively, it might seem incorrect to associate "high energy" with the physics of very small, low mass–energy systems, like subatomic ...
The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [ 2 ] [ 5 ] Common imperial units and U.S. customary units of length include: [ 6 ]
In physics, a characteristic length is an important dimension that defines the scale of a physical system. Often, such a length is used as an input to a formula in order to predict some characteristics of the system, and it is usually required by the construction of a dimensionless quantity, in the general framework of dimensional analysis and in particular applications such as fluid mechanics.
Scale length may refer to: Length scale (or "scale length"), a significant concept in physics used to define the order of magnitude of a system; Scale height (or "scale length"), a specific parameter in physics denoting the distance over which a quantity decreases by a factor of e; Scale length (string instruments), a measurement of the length ...
'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10 −15 metres, which means a quadrillionth of one metre. This distance is sometimes called a fermi and was so named in honour of Italian naturalized to American physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.