public abstract Class DimensionalModel

This class represents the physical model used for dimensional analysis.

In principle, dimensions of physical quantities could be defined as "fundamental" (such as momentum or energy or electric current) making such quantities uncommensurate (not comparable). Modern physics has cast doubt on the very existence of incompatible fundamental dimensions of physical quantities. For example, most physicists do not recognize temperature, Θ, as a fundamental dimension since it essentially expresses the energy per particle per degree of freedom, which can be expressed in terms of energy (or mass, length, and time). To support, such model the method getConverter may returns a non-null value for distinct dimensions.

The default model is Standard. Applications may use one of the predefined model or create their own. DimensionalModel relativistic = new DimensionalModel() { public Dimension getFundamentalDimension(Dimension dimension) { if (dimension.equals(QuantityDimension.LENGTH)) return QuantityDimension.TIME; // Consider length derived from time. return super.getDimension(dimension); // Returns product of fundamental dimension. } public UnitConverter getDimensionalTransform(Dimension dimension) { if (dimension.equals(QuantityDimension.LENGTH)) return new RationalConverter(1, 299792458); // Converter (1/C) from LENGTH SI unit (m) to TIME SI unit (s). return super.getDimensionalTransform(dimension); } }; try { DimensionalModel.setCurrent(relativistic); // Current thread use the relativistic model. Units.KILOGRAM.getConverterToAny(Units.JOULE); // Allowed. ... } finally { cleanup(); }