Skip to main content
1-Visitor
August 17, 2020
Solved

Thermal conductivity units error

  • August 17, 2020
  • 2 replies
  • 3318 views

I am new to Mathcad and in the process of learning. When defining the units of thermal conductivity k=W/m.K, I keep getting an error for the m.K part. Mathcad says it is an undefined variable even though m (for length) and K(for temperature) are both part of units recognized by Mathcad. I am using prime 6.0 version. Appreciate any help I could get.

Best answer by Werner_E

Better you show a pic of the error message and even better if you attach your worksheet so we can see what you did.

My guess is that you ran into a problem of Primes infamous "autolabeling" feature.

You can tell that Prime recognizes the names as units by the blue color (unless you changed that default setting).

If the labeling is wrong you have to set it manually. It was not necessary to do when I typed the definition below in an otherwise empty worksheet, though.

Werner_E_0-1597673679760.png

 

P.S.: You typed an explicit multiplication between m and K, didn't you?

 

2 replies

Werner_E25-Diamond IAnswer
25-Diamond I
August 17, 2020

Better you show a pic of the error message and even better if you attach your worksheet so we can see what you did.

My guess is that you ran into a problem of Primes infamous "autolabeling" feature.

You can tell that Prime recognizes the names as units by the blue color (unless you changed that default setting).

If the labeling is wrong you have to set it manually. It was not necessary to do when I typed the definition below in an otherwise empty worksheet, though.

Werner_E_0-1597673679760.png

 

P.S.: You typed an explicit multiplication between m and K, didn't you?

 

23-Emerald IV
August 17, 2020

Welcome to the forum.

 

There should be no problem with that:

LucMeekes_0-1597673743635.png

Please attach your worksheet (Which, in general you ALWAYS should do), so we can see what goes wrong with it.

 

Success!
Luc

24-Ruby IV
August 17, 2020

Correct unit of Thermal Conductivity W*m/(m^2*K)!

W.png

10-Marble
August 21, 2020

So true, Valery!  I like to keep the "youngsters" thinking of the physics behind the numbers.