System surrounding in Thermodynamics

System and surrounding

System:

                    Quantity of mater or region in space chosen for study is called system.

Surrounding:

                    Mass or reign out side of the system is called surrounding.

Boundary:

                 Boundary is a real and imaginary wall which separates system and Surrounding

It may be Fixed or moveable.

We take it ideally

Types of system:

Closed System:

  In closed system only heat is transfer and no mass is transfer called closed system.

   For example :  in piston only heat is transfer

Open system:

In open system and heat both are transfer is called closed system