Quantity equations do not specify that the input parameters have specific units. Instead, quantity equations may be solved using any coherent system of units.
What Calchemy does is coherse the various systems of units into being mutually coherent! Calchemy allows you to enter the parameters of quantity equations in whatever units you know them in, and gives you the result in whatever units you want.
In practice, it has been common to employ equations that require the use of convenient or familiar units of measure to represent the variables. In contrast to Quantity Equations, these so called "numeric" or "engineering" equations contain some conversion factor that represents the combined conversions required to make the units of the equation coherent. These conversion factors are often dimensionless, but in fact do have units (like ft/meter). This (misleading) representation results in a non-coherent equation.
Calchemy Software Inc.
Fort Collins, CO
Last Updated 6/21/2009