So, you can't add them unless you convert one to the other.

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The discussion focuses on the challenge of adding pressure in KPa to energy in KJ/kg when calculating enthalpy using the Tds relationship. It is clarified that these units do not match and cannot be directly combined without additional context. The conversion between KPa and KJ/kg requires understanding their respective physical dimensions, as KPa represents pressure while KJ/kg represents energy per unit mass. The participants emphasize the need for a consistent unit system to perform the calculations correctly. Ultimately, without proper conversion or context, the addition of these units is not feasible.
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Homework Statement



find ethalpy using Tds relationship

Homework Equations



Tds=dh-vdP

The Attempt at a Solution


i had to reaarange and integrate to solve for enthalpy. but now i need to add a number in KPa to a number in KJ/Kg, can i do this? How do i change KPa to KJ/Kg?
thanks
 
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You can't they don't match - unless there is a bit you are missing.

pressure = kg / (m·s^2)
energy = kg m^2 / s^2

KPa = kg m^1 s^-2
KJ/kg = kg m^2 s^-2 / kg = m^2 s^-2
 
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