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bk_011-Visitor
1-Visitor
February 5, 2015
Question

how to customise unit degree celcius

  • February 5, 2015
  • 6 replies
  • 5539 views

Hello all,

i am using MATHCAD 15,

i want to customise the temperature Default unit (K-Kelvin) in SI to cutomised unit (Degree celcius - oC)

i have tried to convert this using

Tools / worksheeet options / Unit system / Temperature(K) / change unit /in the unit column there is celcius option is given

only "CHANGE DELTA C" is available in need degree celcius

I am new to math cad plaese help me

Regards

Balaji.K

6 replies

Werner_E
Werner_E25-Diamond I
25-Diamond I
February 5, 2015

Temperature is a tricky and beasty dimension and using °C as "unit" has the drawback, that you would have to use different 'units' for temperature and relative temperature (temp. difference). So there is a reason you are only offered delta°C as an alternative to K and not °C as you might have expected.

The problem with working with temperatures was discussed quite often in this forum in more detail - you may use the search function to access the older postings.

Maybe this blog is of interest to you, too: http://blogs.ptc.com/2012/04/27/temperature-units/

or this: http://www.hearne.co.nz/getattachment/17030b69-68b9-4aca-81bd-f7cba86e43a8/Examples-Tutorials-Working-with-Temperatures.aspx

Here is something to think about:

1.png

    A
    AndyWesterman12-Amethyst
    12-Amethyst
    February 5, 2015

    Hi.

    Your issue seems very strange, when I try to insert a unit I am given the following options:

    Capture.PNG

    Perhaps it is something to do with the revision ...

    I am using version 15 M010

    Capture.PNG

    Does anyone know at what release PTC added the °C function?

    Regards

    Andy

    Werner_E
    Werner_E25-Diamond I
    25-Diamond I
    February 5, 2015

    A Westerman wrote:

    Hi.

    Your issue seems very strange, when I try to insert a unit I am given the following options:

    Perhaps it is something to do with the revision ...

    I am using version 15 M010

    No Andy, Balaji is not trying to simply insert a temp unit but he attempted to change the default temp unit for the sheet. Here (for good reasons) only temp change delta°C is offered but not °C itself.

    The problem with Celsius and Fahrenheit scales is their offset from 0.

    So when you add temps in degree Celsius all summands but one have to be temp change: 1.png

    Thats the reason only delta°C can be offered as replacement for Kelvin and not °C.

      A
      AndyWesterman12-Amethyst
      12-Amethyst
      February 5, 2015

      Ah, misunderstood.

      Absolutely agree - can only make sense working with K or R & then convert the answer into °C

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