2.Work (W Work is an energy transfer into or out of a system except heat.Work is not a state function Prescript:a system does work on its surroundings, W<0 (lose work) the surroundings does work on a system W>0 (get work) Work can be of two types:volume work,and non-volume work Electrical,surface work etc) Work is an energy transfer into or out of a system except heat. a system does work on its surroundings， W<0（lose work） the surroundings does work on a system ， W>0（get work） 2.Work ( W ) Prescript： non-volume work ( Electrical, surface work etc) Work is not a state function Work can be of two types: volume work, and