Quantity defined by a value and a unit. The following constructors are supported: Quantity() -- empty constructor Quantity(Value) -- empty constructor Quantity(Value,Unit) -- empty constructor Quantity(Quantity) -- copy constructor Quantity(string) -- arbitrary mixture of numbers and chars defining a Quantity Quantity sets the quantity to the power returns a quantity with the translation factor and a string with the prevered unit Numeric Value of the Quantity (in internal system mm,kg,s) Unit of the Quantity Unit of the Quantity