processes. 18. 0 A system expands by 0.75 m3 at a constant pressure of 125 kPa. Find the , heat that ows into or out of the system if its internal energy (a).increases by _ 1' 65 k] or (13) decreases by 33 k]. In each case, give the direction of heat ow. ,9 A M. :. 1mm :9. a nnrav inmlated