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GNU Units converts quantities expressed in various systems of
measurement to their equivalents in other systems of measurement,
including conversions from and to sums of units, such as converting
between meters and feet plus inches.  Beyond simple unit conversions,
GNU Units can be used as a general-purpose scientific calculator that
keeps track of units in its calculations.  You can form arbitrary
complex mathematical expressions of dimensions including sums,
products, quotients, powers, and even roots of dimensions.  Thus you
can ensure accuracy and dimensional consistency when working with long
expressions that involve many different units that may combine in
complex ways.

The major changes Version 2.00 are:

* Conversion to sums of units (e.g. feet and inches, or hours and minutes)
* Support for unicode with UTF-8
* A script can update currency rates
* Unit definitions can be set based on environment variables

For more information visit http://www.gnu.org/software/units 
The new release can be obtained from http://ftp.gnu.org/gnu/units/