metrum.units

This is a collection of unit of measurement.

Each unit is defined by a variable (e.g. m, mm, kg, s, etc.), which is supposed to be used as shown in the following example:

height = 180*cm    # cm = 0.01*m, therefore height holds 0.18 (m)
weight = 250*g     # g = 0.001*kg, therefore weigth is now 0.25 (kg)
width = 10*usc_in  # usc_in = 0.0254*m, therefor width is now 0.254 (m)

By using the units contained in this module as shown above, you can achieve two beneficial results:

• Make your code more readable, by explicitily indicating the units of measure
• Express all the quatities in a consistent set of reference units (e.g. all distances are in metre, all weights in kg, all times in s, etc.)

The reference units to which every other unit is coverted are shown in the following table, of which the first 7 are SI base units and the rest are SI derived units.

For each reference variable U in the previous table, the following additional 12 variables are defined as well:

• pico-unit : pU = 1e-12*U
• nano-unit : nU = 1e-9*U
• micro-unit: uU = 1e-6*U
• milli-unit: mU = 1e-3*U
• centi-unit: cU = 1e-2*U
• deci-unit : dU = 1e-1*U
• deca-unit : daU = 1e+1*U
• hetto-unit: hU = 1e+2*U
• kilo-unit : kU = 1e+3*U
• mega-unit : MU = 1e+6*U
• giga-unit : GU = 1e+9*U
• tera-unit : TU = 1e+12*U

Finally, the following special units are defined.

value = 12.5*unit