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The petametre (SI symbol: Pm) is a unit of length in the metric system equal to 10 15 meters. To help compare different distances this section lists lengths starting at 10 15 m (1 Pm or 1 trillion km or 6685 astronomical units (AU) or 0.11 light-years). 1.0 Pm = 0.105702341 light-years
Length, in meters Reference The classical electron radius r e: 2.817 940 285 (31) × 10 −15 [13] The Compton wavelength of the electron λ C: 2.426 310 215 (18) × 10 −12 [13] The reduced Compton wavelength of the electron λ C: 3.861 592 6764 (18) × 10 −13 [14] The Compton wavelength (or reduced Compton wavelength) of any fundamental ...
'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.
a = 543.102 0504(89) × 10 −12 m, corresponding to a resolution of ΔL/L ≈ 3 × 10 −10. Similar techniques can provide the dimensions of small structures repeated in large periodic arrays like a diffraction grating. [15] Such measurements allow the calibration of electron microscopes, extending measurement capabilities.
For example, 5 km is treated as 5000 m, which allows all quantities based on the same unit to be factored together even if they have different prefixes. A prefix symbol attached to a unit symbol is included when the unit is raised to a power. For example, 1 km 2 denotes 1 km × 1 km = 10 6 m 2, not 10 3 m 2.
Horses are used to measure distances in horse racing – a horse length (shortened to merely a length when the context makes it obvious) equals roughly 8 feet or 2.4 metres. Shorter distances are measured in fractions of a horse length; also common are measurements of a full or fraction of a head, a neck, or a nose. [10]
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At one time, it was a free download for Mac OS 9, Mac OS X 10.3, and Mac OS X 10.4. However, these may lack some features of 1.0 and may include promotion for the more advanced, commercial version of the software. A Windows version (offered for sale) was renamed NuCalc. The app has been ported from C++ to SwiftUI. [3]