In the S.I. (metric) system the enthalpy of air is measured in: Power Engineering Chapter 125 In the S.I. (metric) system the enthalpy of air is measured in: a. degrees Celsius b. percent c. BTU/kg of dry air d. kJ/kg of dry air e. kW/kg of dry air Answer: D Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+