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gatlas11-Garnet
11-Garnet
May 24, 2026
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Need my answer in pressure units expressed as mmHg.

  • May 24, 2026
  • 3 replies
  • 95 views

I’m trying to express the solution in mmHg as a unit for pressure. Is there any way to do this? 

Best answer by Fred_Kohlhepp

You can define a special unit as you did, or develop a more accurate version from Mathcad’s unit library,

But there’s no way I know to make Mathcad use it automatically. 

3 replies

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gatlas11-GarnetAuthor
11-Garnet
May 24, 2026

I’m using PTC Mathcad Prime 12.0.0.1

F
Fred_Kohlhepp23-Emerald IAnswer
23-Emerald I
May 24, 2026

You can define a special unit as you did, or develop a more accurate version from Mathcad’s unit library,

But there’s no way I know to make Mathcad use it automatically. 

    W
    Werner_E25-Diamond I
    25-Diamond I
    May 24, 2026

    PTC has introduced a custom unit system but the development is by far not where users would like it to be.

    As far as I am aware there is no way to let Prime display results automatically in user-defined units.

    But you sure can define your own unit mmHg like you did or more accurate using the built-in in_Hg unit as suggested by Fred. BTW, I don’t understand why in_Hg is built-in, but mmHg is not.

    When you display a result of dimension pressure, Prime uses the default pressure unit, dependent on the unit system selected. In case of SI that’s Pascal.
    But you always can overwrite the unit Pa in the result by any unit you like - Prime will happily adjust the result accordingly.

    Unfortunately you will have to do so manually for every result you want to be shown in mmHg.

     

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