ic unit. For example, while meter
      is a unit, 3.0 meters is a quantity. Quantities obey two separate algebras:
      the native algebra for their value type, and the dimensional analysis algebra
      for the associated unit. In addition, algebraic operations are defined between
      units and quantities to simplify the definition of quantities; it is effectively
      equivalent to algebra with a unit-valued quantity.
    </p>
<p>
      Quantities are implemented by the <span class="underline"><code 