Why do I get a "units are not commensurate" error when adding or subtracting the units 'C' and 'K'?

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MathWorks Support Team 2016-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/296806-why-do-i-get-a-units-are-not-commensurate-error-when-adding-or-subtracting-the-units-c-and-k

编辑： MathWorks Support Team 2022-10-8

I am trying to subtract two temperatures in Simscape. One temperature is in Celsius, and the other is in Kelvin. Why do I get a "units are not commensurate" error when adding or subtracting the units 'C' and 'K'?

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Answer 1

MathWorks Support Team 2022-10-8

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编辑：MathWorks Support Team 2022-10-8

For Simscape to be able to subtract two units, the units have to be able to be converted into similar units. For example, you can subtract Celsius from Kelvin because they are both temperatures, and you can convert Celsius into Kelvin (or Kelvin into Celsius).

In Simscape, 'C' represents Coulomb. Because the two units Coulomb and Kelvin cannot be converted into the same unit (they're not both temperatures), Simscape throws the error. Instead, represent Celsius with the unit 'degC'. The list of unit definitions for Simscape can be found at the following link:

https://www.mathworks.com/help/simscape/ug/unit-definitions.html