Explain classification of systems
Answers
An open system is a thermodynamic system which allows both mass and energy to flow in and out of it, across its boundary. The image below illustrates open system.
Example of open system: Water heated in an open container – Here, heat is the energy transferred, water is the mass transferred and container is the thermodynamic system. Both heat and water can pass in and out of the container.
2. Closed System:A closed system allows only energy (heat and work) to pass in and out of it. It does not allow mass transfer across its boundary. The following image shows a closed system:
Example of closed system: Water heated in a closed vessel – Here only heat energy can pass in and out of the vessel
3. Isolated System:An isolated system does not interact with its surroundings. It does not allow both mass and energy transfer across its boundary. It is more restrictive.
In reality, complete isolated systems do not exist. However, some systems behave like an isolated system for a finite period of time. The following image illustrates an isolated system:
(Hope this helps)
Answer:
Depending upon the exchange of energy and
matter with the environment, thermodynamic sys-
tems are classified as open, closed or isolated.
A system that can freely exchange energy and
matter with its environment is called an open
system. Example: water boiling in an open vessel.
A system that can freely exchange energy but not
matter with its environment is called a closed
system. Example : water boiling in a closed vessel.
A system that cannot exchange energy as well as
matter with its environment is called an isolated
system. In practice it is impossible to realize an
isolated system as every object at a temperature
above 0 K emits energy in the form of radiation, and
no object can ever attain 0 K.
For many practical purposes, a thermos flask
containing a liquid can be considered an isolated
system.