Weird Units Conversion

[Giuseppe Donnini]

1. 1000000_ft^3 'Mcbf' STO
   (Store the unit object 1000000_ft^3 into the variable Mcbf or whatever name you want to assign to your new unit).
    
2. { 1_Mcbf } TMENU
   (Add any units you want to the list. Note that it is not sufficient to put the name of the unit into the list, you must use a full unit object, e.g. if you want to add ft^3, put 1_ft^3 into the list).
   

This produces a menu key for your new unit with the same functionality as a built-in unit menu key, i.e.:

   [Mcbf]  multiplies by the new unit;
LS+[Mcbf]  converts to the new unit;
RS+[Mcbf]  divides by the new unit.

Try  5000000_ft^3 LS+[Mcbf], and you will get the expected result of  5_Mcbf.

Note that this new unit is a simple, non-compound unit which may itself be prefixed with any SI prefix.