Example of internal irreversibility - Thermodynamics

Q.  The irreversibility in the system caused by friction is an example of
- Published on 21 Aug 15

a. internal irreversibility
b. external irreversibility
c. frictional irreversibility
d. chemical irreversibility

ANSWER: internal irreversibility
 
All the spontaneous processes are irreversible in nature. The irreversibility is caused by finite potential gradient like temperature gradient etc. or by any dissipative effect like friction. There are two types of irreversibility

i. Internal irreversibility
ii. External irreversibility

Internal irreversibility is caused by internal dissipative effects in the system like friction, turbulence, electric resistance etc. Thus the irreversibility in the system caused by friction is an example of internal irreversibility.

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