# What is the change of entropy in irreversible adiabatic change?

## What is the change of entropy in irreversible adiabatic change?

Ds = Dq/T = nRln(a2/a1). If the final specific volume a2 is greater than the initial a1 then the entropy change is positive, while for a compression it is negative. For a reversible adiabatic expansion dq=0 and the entropy change is ds=0. This is the isentropic process defined previously.

### What is the entropy change for an adiabatic reversible process?

we see that the entropy change of a system during for a reversible, adiabatic process is zero.

**What is the change in entropy for irreversible and reversible processes?**

Section Summary. Entropy is the loss of energy available to do work. Another form of the second law of thermodynamics states that the total entropy of a system either increases or remains constant; it never decreases. Entropy is zero in a reversible process; it increases in an irreversible process.

**Can adiabatic process be reversible and irreversible?**

Answer: No. Workdone in reversible is always more than the workdone in irreversible. The reason is the system has to work against the gradual higher external pressure in reversible condition. Whereas the external pressure is constant, no rising in irreversible condition, hence work is less.

## In which conditions does entropy change not zero?

So to get the entropy change for the irreversible adiabatic process, you need to devise an alternative reversible path between the same two end states, and this reversible path will not be adiabatic.

### What is entropy of irreversible process?

An irreversible process increases the entropy of the universe. Because entropy is a state function, the change in entropy of the system is the same, whether the process is reversible or irreversible. The second law of thermodynamics can be used to determine whether a process is reversible or not.

**Why entropy is constant in adiabatic process?**

According to thermodynamics, a process is said to be adiabatic if no heat enters or leaves the system during any stage of the process. As no heat is allowed to transfer between the surrounding and system, the heat remains constant. Therefore, the change in the entropy for an adiabatic process equals to zero.

**How does entropy change in an irreversible process?**

## Can entropy change in a reversible process?

This is true of all reversible processes and constitutes part of the second law of thermodynamics: the entropy of the universe remains constant in a reversible process, whereas the entropy of the universe increases in an irreversible (spontaneous) process. It also increases during an observable non-spontaneous process.

### Is change in entropy zero in adiabatic process?

**Why is entropy always increasing?**

Even though living things are highly ordered and maintain a state of low entropy, the entropy of the universe in total is constantly increasing due to the loss of usable energy with each energy transfer that occurs.