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The average distance between the Earth and the Sun is a natural distance unit and is called an Astronomical Unit (AU).
A handy conversion calculator for some common pressure units.
Details of the SI Base Units, derived units and prefixes.
Extensive reference for scientific and mathematical equations, constants and tabular data. Includes unit conversion calculator, Greek alphabet, periodic table and astronomical fact sheets.
List of basic units, SI prefixes (between 10^14 and 10^-14), and derived units.
A list of SI Units and derived units.
The fundamental SI unit of pressure is the Pascal (Pa), but it is a small unit so kPa is the most common direct pressure unit for atmospheric pressure.
A comprehensive site listing and explaining the SI system of units, including the prefixes used.
Introduction to units and the Systeme International.
A short piece on unit vectors explaining what they are and how they are used.
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