User-Specified Units

You do not always need to use the default units for variables. Using ENTER_SYMBOL, you can convert the value of variable from the default unit to your preferred unit. (Some response-driven modules also allow you to set conditions in non-default units.) User-defined symbols in the form of functions can be used for plotting in the POST module, but they cannot be used as conditions in POLY. User defined symbols in the form of variables can be used as conditions.

For example, if you want pressure to be plotted in bar rather than Pa, then you define the following function PB:

Enter_symbol function PB = P/1E5 ;

If you wanted heat capacity of a system to be shown as in terms of J/mol/K, then you can define the following function Cp:

Enter_symbol function Cp = Hm.T ;

If the variable you want to convert is a function of one or more derivatives, then you must enter the symbol as a variable rather as a function. For instance, a symbol expressing heat capacity of a system in a unit of cal/mol/K can be defined as the following variable Cp2:

Enter_symbol variable Cp2 = Hm.T/4.1858 ;

Examples of User-Defined Units for information about entering conventional functions and the associated units.