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Units

@unitfact

Units of measurement, constants, dimensional analysis, etc. From @JohnDCook

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linkhttp://JohnDCook.com calendar_today11-04-2014 13:09:23

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Informally, an astronomical unit is the distance from the Earth to the sun. Officially it is 149,597,870,700 meters.

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Standard SI prefixes for factors of 10^6 and higher use upper case letters. Smaller factors and fractions use lower case letters.

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An electron volt (eV) is the amount of energy gained by a charge of one electron moved across an electric potential difference of one volt.

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Standard SI prefixes are single Roman letters with two exceptions: the prefix for deca uses two letters, da, and the prefix for micro is μ.

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The constant G in Newton's law of gravity is only known to between 3 and 4 significant figures. en.wikipedia.org/wiki/Gravitati…

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SI unit names are not capitalized, except for Celsius. Unit abbreviations are capitalized if and only if they units are named after people. So for example, Pascal is the man, pascal is the unit, and Pa is the abbreviation.