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A Dictionary of Units
This provides a summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to ...
Unit Conversions
Offers information and conversion factors for a wide variety of units do you know what a Reyn is ?
Conversions - Mass
This site allows you to convert between a wide variety of mass unit. Enter the value to convert from in the 'From' box and select its units from the list. Then select the units to convert to from the ...
Atmospheric Pressure
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. 1 mm Hg is an old unit of pressure ...
A Dictionary of Units
Comprehensive list of physical units, including the history of measurement and conventions. Also provides a comparison between units in the UK and USA
Units of Measurement
Details of the SI Base Units, derived units and prefixes.
SI Units
List of basic units, SI prefixes (between 10^14 and 10^-14), and derived units.
TCAEP.co.uk - SI Units
A list of SI Units and derived units.
Astronomical Unit
The average distance between the Earth and the Sun is a natural distance unit and is called an Astronomical Unit (AU).
Units
This Java Applet allows you to work out Units using mass, length and time. By either multiplying or dividing the applet will automatically fill in the units - ie mass divided by time = m/s = velocity.

