Definition of An Open System

Closed System

This water heater is an example of an open system.

Open System

A fixed region of space, a device, or a collection of devices in which mass crosses the system boundary.
a quantity of mass or a volume of space that
we have chosen to study and the surroundings are everything else in the universe. The system boundary separates the system from the surroundings.
System -
A water heater is an open system.

Closed Systems

Open Systems

Types of Systems:

Piston and cylinder

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Ch 1, Lesson C, Page 3 - Definition of An Open System