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In Mathcad I type R to get degrees rankine, a temperature unit. But spirit is taking it to be the universal gas constant. Must use drop down unit menu to get R as a temperature unit.
It's a matter of labeling. R is defined as a unit as a degree Rankine and as a constant as the universal gas constant (on a molar basis). Unlabeled, it refers to the constant, not the unit. Attach a label to get whichever you really want. __________________ � � � � Tom Gutman