5. An idea gas with N atoms are contained in a cylinder with insulating walls, closed at one end by a piston. The initial volume is V1 and the initial temperature T1. If the volume was suddenly expanded freely from V1 to V2, and the temperature was changed from T1 to T2. Questions: The temperature T1 is larger, lower, or the same to T2? Ans：___(6)____.During the expansion, the pressure was changed from P1 to P2. The pressure P1 is larger, lower, or the same to P2?Ans：___(7)____ Find the change in entropy that would occur.Ans：___(8)____