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10-Marble
November 15, 2025
Solved

These units are not compatible

  • November 15, 2025
  • 1 reply
  • 255 views

I'm using MathCAD 9.0.0.0. For whatever reason, MathCAD is having a problem with variable units of my final equation in my attached file.

BB_14100646_0-1763227157819.png

 

Best answer by Werner_E

When Prime moans about incompatible units its usually correct. Unit checking is one of the strengths of the program.

In your case "Bcg" is a length/distance, but "wL" is a weight. You sure can't add quantities of different dimensions.

 

Maybe you meant a product instead of the sum?

Werner_E_0-1763228559518.png

 

Or more likely you wanted to use "wb" instead of "Bcg" !?

Werner_E_1-1763228730884.png

 

1 reply

Werner_E25-Diamond IAnswer
25-Diamond I
November 15, 2025

When Prime moans about incompatible units its usually correct. Unit checking is one of the strengths of the program.

In your case "Bcg" is a length/distance, but "wL" is a weight. You sure can't add quantities of different dimensions.

 

Maybe you meant a product instead of the sum?

Werner_E_0-1763228559518.png

 

Or more likely you wanted to use "wb" instead of "Bcg" !?

Werner_E_1-1763228730884.png

 

10-Marble
November 15, 2025

Yes, you are correct with the wb. Thank you! I have another one with the same error, but different problem. I'll start a new post.