What is the critical temperature of N2O: (A) 118 degrees, (B) -88 degrees, (C) 26 degrees, (D) 36.5 degrees
Answer is D. In thermodynamics, a critical point (or critical state) is the endpoint of a phase equilibrium curve. The most prominent example is the liquid-vapor critical point, the endpoint of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by a critical temperature Tc and a critical pressure pc, phase boundaries vanish. critical temperature of N2O: 38.5degC