関連ワード:  why is enthalpy a state function    why is enthalpy a state function but not heat    why is heat a state function    why is enthalpy considered a state function    why is enthalpy not a state function    why is heat not a state function    why is heat q not a state function    why is heat capacity not a state function    is enthalpy a state function or pathway dependent    is enthalpy a state function in thermodynamics