It is imaginary as it assumes the presence of
frictionless and weightless piston.
Answers
Answer:
Terminology of Thermodynamics
The important parts of the study of thermodynamics are a few terms and definitions, which must be understood clearly, and these are as follows:
1. System, boundary and surroundings: A thermodynamic system may be defined as any specified portion of matter in the universe which is under study. A system may consist of one or more substances.
The rest of the universe which might be in a position to exchange energy and matter with the system is called the surroundings.
Thus, the system is separated from the surroundings by a boundary which may be real or imaginary.
In experimental work, a specific amount of one or more substances constitutes the system. Thus 200 g of water contained in a beaker constitutes the thermodynamic system. The beaker and the air in contact are the surroundings.