Reply To: Treatment of current measurements in formulas
Mike,
Thank you for the question.
You are correct that letters representing units of measure may be variables or abbreviations depending upon the situation.
When a letter stands in for an unknown value, it is likely a variable. When a letter or letter combination stands for a standardized unit of measure, it is likely an abbreviation.
Some additional discussion of "variable or abbreviation?" can be found in the Provisional Revised Nemeth Course Manual, posted by NFB. I would direct you to Lesson 5, section 5.1.2.
Please post here again if you have follow-up questions.
–Kyle