Hey guys. I have a problem in adiabatic cooling and expansion and there is something I didn't understand. when we are compressing air without transfering heat(so adiabatically), why does the air heat? As I know, because of moving "wall". when molecules heat on moving wall kind of baseball bat hits the ball. they are moving with more velocity(kinetic energy). and when we expand air by that wall air cools down because of ... that's right. but does temperature depend on velocity of that wall? the adiabatic expansion/compression formula (VT^..) says that not. but actually if our explanation is true, it must depend. so what is the main idea of that?