Skip to main content
B
BB_1410064610-Marble
10-Marble
December 3, 2025
Solved

Bogus Units of Measure

  • December 3, 2025
  • 2 replies
  • 300 views

I'm using MathCAD Prime 9.0.0.0. MathCAD is always forcing Units of Measure. Usually it'll choose appropriately based on the data going into it. However, sometimes it's wrong or uses weird units and won't allow me to override. A work around is I can not use units at all or I can put in a 2nd equation without units, but I shouldn't have to do that. One of the advantages to MathCAD is I can use multiple units in the same equation and MathCAD knows the difference. In this case...

I want...

BB_14100646_0-1764791293270.png

...but I get...

BB_14100646_1-1764791335672.png

I want...

BB_14100646_2-1764791381264.png

...but I get...

BB_14100646_3-1764791423548.png

 

Thanks,

      Brent

Best answer by rgunwaldsen

Change lb to lbf.

 

rgunwaldsen_0-1764793086946.png

 

2 replies

R
rgunwaldsen15-MoonstoneAnswer
15-Moonstone
December 3, 2025

Change lb to lbf.

 

rgunwaldsen_0-1764793086946.png

 

    B
    BB_1410064610-MarbleAuthor
    10-Marble
    December 3, 2025

    Perfect! Thank you!!

    S
    StuartBruff23-Emerald V
    23-Emerald V
    December 3, 2025

    What you've defined g as is the density of water.  The lb is a unit of mass in Mathcad USCS, not weight (force).   Here is the corrected specific weight of water, which automatically corrects the problem with PB.

     

    2025 12 03 A.png

     

    Stuart

    Terms & ConditionsCookie settingsAccessibility statement