
Can entropy change be zero?
Answer
464.1k+ views
1 likes
Hint:Entropy tells the disorder or randomness in the system, and it is caused when the molecules move in a zig-zag motion. It is denoted by , and it is defined for both the reversible and irreversible process.
Complete step-by-step answer:There are two types of processes, i.e., reversible and irreversible. A reversible process is a process in which the process starts from step 1 to step 2 then it returns to step 1. Irreversible processes are those in which the process starts from 1 to step 2 but doesn't return back to step 1.
Entropy tells the disorder or randomness in the system, and it is caused when the molecules move in a zig-zag motion. It is denoted by , and it is defined for both the reversible and irreversible process.
According to the second law of thermodynamics, the entropy of the system, i.e., the disorder can never be negative it can be either positive or zero.
For a reversible process, the change in entropy is zero because of the increase in entropy when the process moves forwards, and then it decreases when it moves backward.
For an irreversible process, the change in entropy will always be positive because when the reactant changes to the product there is always an increase in the randomness.
So, the entropy change can be zero for the reversible process.
Note:Mathematically we can calculate the change in entropy by taking the ratio of change in heat of the system by the temperature of the system. It is given below:
Complete step-by-step answer:There are two types of processes, i.e., reversible and irreversible. A reversible process is a process in which the process starts from step 1 to step 2 then it returns to step 1. Irreversible processes are those in which the process starts from 1 to step 2 but doesn't return back to step 1.
Entropy tells the disorder or randomness in the system, and it is caused when the molecules move in a zig-zag motion. It is denoted by
According to the second law of thermodynamics, the entropy of the system, i.e., the disorder can never be negative it can be either positive or zero.
For a reversible process, the change in entropy is zero because of the increase in entropy when the process moves forwards, and then it decreases when it moves backward.
For an irreversible process, the change in entropy will always be positive because when the reactant changes to the product there is always an increase in the randomness.
So, the entropy change can be zero for the reversible process.
Note:Mathematically we can calculate the change in entropy by taking the ratio of change in heat of the system by the temperature of the system. It is given below:
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Trending doubts
Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

The flightless birds Rhea Kiwi and Emu respectively class 11 biology CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

How much is 23 kg in pounds class 11 chemistry CBSE
