版权所有：华东理工大学物理化学教研室 16 0- 4 Systems and surroundings For the purposes of physical chemistry, the universe is divided into two parts, the system and its surroundings. The system is the part of the world in which we have a special interest. The surroundings are where we make our measurements. The type of system depends on the characteristics of the boundary that divides it from the surroundings. 16 0. Basic concepts版权所有：华东理工大学物理化学教研室 16 0- 4 Systems and surroundings For the purposes of physical chemistry, the universe is divided into two parts, the system and its surroundings. The system is the part of the world in which we have a special interest. The surroundings are where we make our measurements. The type of system depends on the characteristics of the boundary that divides it from the surroundings. 16 0. Basic concepts