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Hartree defined units based on three physical constants: [1]: 91 Both in order to eliminate various universal constants from the equations and also to avoid high powers of 10 in numerical work, it is convenient to express quantities in terms of units, which may be called 'atomic units', defined as follows:
au ≡ 149 597 870 700 m ... ≡ 2.54 cm ≡ 1 ... See Weight for detail of mass/weight distinction and conversion. Avoirdupois is a system of mass based on a pound ...
Unit type Unit code Unit name Area: a: are: m2: square metre Charge: coulomb: coulomb Energy: J: joule Force: N: newton Length: m: metre Magnetic field strength: T ...
The factor–label method can convert only unit quantities for which the units are in a linear relationship intersecting at 0 (ratio scale in Stevens's typology). Most conversions fit this paradigm. An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees ...
Nevertheless, the absorbance unit or AU is commonly used in ultraviolet–visible spectroscopy and its high-performance liquid chromatography applications, often in derived units such as the milli-absorbance unit (mAU) or milli-absorbance unit-minutes (mAU×min), a unit of absorbance integrated over time.
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Abbreviations for "arbitrary unit" include: arb. unit, [1] arb. u., AU, [3] and a.u. [4] Among these, "AU" and "a.u." are common abbreviations for astronomical units and atomic units. [5] For this reason, Physical Review journals, the Japanese Journal of Applied Physics , and an increasing number of other academic journals , recommend against ...
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