Rothalpy
Rothalpy (or trothalpy) I {\displaystyle I} , a short name of rotational stagnation enthalpy, is a fluid mechanical property of importance in the study of flow within rotating systems. == Concept == Consider we have an inertial frame of reference X Y Z {\displaystyle XYZ} and a rotating frame of reference x y z {\displaystyle xyz} which both are sharing common origin O {\displaystyle O} .