Units

[ptc-1413150]

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.

Paul

[TomGutman]

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.
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� � � � Tom Gutman

[ValeryOchkov]

Better for degrees Rankine is �R.
We have in Mathcad 14 R and �R as degrees Rankine.
Val
http://twt.mpei.ac.ru/ochkov/v_ochkov.htm