I have air flowing through a gate valve with lengths of pipe of matching diameter upstream and downstream. At a certain distance from the valve upstream and downstream, I am measuring static temperatures and static and stagnation pressures. I can estimate the Mach numbers at the tapping points using the static and stagnation pressures and using those Mach numbers, I can calculate the stagnation temperatures. Now using the difference in stagnation pressures and temperatures (i.e. delta P0 and delta T0) which would basically have units of N/m² and °K respectively, is it possible convert those quantities into respective energy loss units of kJ/kg. It's been over a decade since I took thermodynamics and I can't for the life of me remember if it's even possible to convert °K to an equivalent kJ/kg. Please help! I don't expect a readymade solution, but if someone can recommend a good reference book, I would really appreciate it. Thank you in advance.