Q29. Define any 3
terms. Also give an
example with each:
1) system
2) reversible process
3) state function
4) Isolated system
Answers
Answer:
2 A reversible process is one which can be taken from its initial state to another state, and then back to the initial state without any change to either the system or the surroundings. Examples of these are the following: • frictionless motion of solids (no friction between mating surfaces)
3 The thermodynamic state of a system refers to the temperature, pressure and quantity of substance present. State functions only depend on these parameters and not on how they were reached. Examples of state functions include density, internal energy, enthalpy, entropy. ... Two examples of path functions are heat and work.
4 Isolated systems: An isolated system is special type of closed system that does not even transfer energy across the boundary. There will be no interactions with the surroundings. ... A perfectly insulated, rigid and closed vessel is an example of an isolated system as neither mass nor energy can enter or leave the system.