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:
14 comments Page 1 of 2.
Aniket pisal said:
7 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.
Sagar singh said:
2 years 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.
Diwakar Chaurasia said:
9 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.
Nagendra singh said:
8 years ago
Entropy of system will decrease by removal of heat & increase by adding of heat. But entropy of universe is always increased.
Pradeep singh said:
1 decade ago
True only for reversible process. For irreversible process entropy change may be positive even if heat is removed.
M S NAYAK said:
7 years ago
Entropy is never negative for irreversible process even heat is removed so,
Correct answer is B.
Correct answer is B.
(1)
Harsh said:
8 years ago
For reversible process entropy is + ve, - ve, and 0.
For irreversible process always +ve.
For irreversible process always +ve.
Sunny said:
4 months ago
As temperature increases entropy increases temp decreases entropy decreases.
Ototo Erick said:
9 years ago
Change in entropy must be negative if temperature is remove and vice versa.
Shekhar Ghotekar said:
8 years ago
For a process, entropy can have positive, negative or zero value?
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