I find really confused about the adiabatic process. According to my textbook, adiabatic process is a process in which no heat is allowed to flow into or out of a system. According to the first law of thermodynamics, change in internal energy=heat added to system- work done by system,so change in Q is equal to -W in an adiabatic process. And change in U=3/2kT.So, if there is work done on a system, the temperature of a system will change even if there is no heat added to the system. This is exactly the part that comfuses me. Why an object can change its temperature without heat adding into it? And work done is also associated with heat. Without heat addition, how is work done possible?