Not sure if this is the right place. But I'm trying to convert heat transfer units like BTU/hr-ft-F to W/m^2-K. It seems like SMath can convert temperature units by themselves, but not when combined with other units. Unless I'm doing something wrong.

Hello,

The simplest answer is that you can not use Celsius and Fahrenheit (relative scales) but use Kelvin and Rankine (absolute scales). You should use them like in the picture. Define a temperature differences and then use them in heat transfer units (or just use Kelvin and Rankine instead of Celsius and Fahrenheit)

Regards,
Radovan

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Thanks! That's very helpful!