Once I add units to the variable, the plot value is off by 386. If I change the units to lb/in^2 the result is correct. However, the units for pressure are NOT lb mass. I tweaked settings in Tools/Worksheet Options but I have not found the correct combination.
What did I miss?
Randy Straley wrote:
Once I add units to the variable, the plot value is off by 386. If I change the units to lb/in^2 the result is correct. However, the units for pressure are NOT lb mass. I tweaked settings in Tools/Worksheet Options but I have not found the correct combination.
What did I miss?
You missed that Mathcad stores values in terms of base units (eg, Length and Mass) not derived units (eg Pressure). In addition, Mathcad defines Pressure as pound-force per square inch, so there will be the usual conversion to lb.in/s^2. You get back the correct display value by dividing your function by psi.
Stuart
