版权所有：华东理工大学物理化学教研室 7 △U, independent of the path, an exact differential.An exact differential is an infinitesimal quantity which, when integra-ted, gives a result that is independent of the path between the initial and final states. q or w, dependent on the path,an inexact differential.When a system is heated, the total energy transferred as heat is the sum of all individual contributions at each point of the path. 1). Exact and inexact differential △q qf - qi q dq dq 3.1 State functions版权所有：华东理工大学物理化学教研室 7 △U, independent of the path, an exact differential.An exact differential is an infinitesimal quantity which, when integra-ted, gives a result that is independent of the path between the initial and final states. q or w, dependent on the path,an inexact differential.When a system is heated, the total energy transferred as heat is the sum of all individual contributions at each point of the path. 1). Exact and inexact differential △q qf - qi q dq dq 3.1 State functions