# Mechanical Engineering - Thermodynamics - Discussion

Discussion Forum : Thermodynamics - Section 3 (Q.No. 4)

4.

The change of entropy, when heat is removed from the gas, is negative.

Discussion:

13 comments Page 1 of 2.
Sagar singh said:
7 months ago

Entropy is always increasing when the process is irreversible.

In some cases, if heat emitting is more than heat absorbing then the entropy is negative.

In some cases, if heat emitting is more than heat absorbing then the entropy is negative.

M S NAYAK said:
6 years ago

Entropy is never negative for irreversible process even heat is removed so,

Correct answer is B.

Correct answer is B.

(1)

Aniket pisal said:
6 years ago

Entropy =change in heat /temperature.

Δs=delta Q/T.

As heat is removed from gas change in heat is negative hence,

Δs= -deltaQ/T.

Hence deltaQ/T= -Δs.

ie. Entropy is negative.

Δs=delta Q/T.

As heat is removed from gas change in heat is negative hence,

Δs= -deltaQ/T.

Hence deltaQ/T= -Δs.

ie. Entropy is negative.

Nagendra singh said:
7 years ago

Entropy of system will decrease by removal of heat & increase by adding of heat. But entropy of universe is always increased.

Harsh said:
7 years ago

For reversible process entropy is + ve, - ve, and 0.

For irreversible process always +ve.

For irreversible process always +ve.

Shekhar Ghotekar said:
7 years ago

For a process, entropy can have positive, negative or zero value?

Diwakar Chaurasia said:
8 years ago

Yes @Ototo erick you are right.

The change in entropy can be negative it is possible somehow but the entropy can't be negative anyhow.

The change in entropy can be negative it is possible somehow but the entropy can't be negative anyhow.

Ototo Erick said:
8 years ago

Change in entropy must be negative if temperature is remove and vice versa.

Krishna said:
8 years ago

Change in entropy can be negative but entropy can't be.

Shahil said:
9 years ago

By Ts diagram of a reversible process s2-s1 is negative.

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