Mechanical Engineering - Thermodynamics - Discussion


When the gas is cooled at constant pressure,

[A]. its temperature increases but volume decreases
[B]. its volume increases but temperature decreases
[C]. both temperature and volume increases
[D]. both temperature and volume decreases

Answer: Option D


No answer description available for this question.

Manoj said: (Aug 23, 2014)  
By charles law.

At constant pressure volume is directly proportional to temperature.

Mubashir said: (Dec 3, 2015)  
Yes @Manoj. But when gas is heated at constant pressure. Right answer is D because here is "cooled" word.

Kavi said: (Dec 9, 2016)  
But cooling is also temperature reduction process, law is not only for the increase in temperature @Mubashir.

Chahat Sharma said: (Mar 15, 2017)  

Therefore, when gas is cooled so temperature decreases so eventually volume will also decrease since direct relationship exists.

Sanjay Gandhi said: (Feb 10, 2018)  
Based on Charles's law.

Karthick Ravi said: (Jun 22, 2018)  
When gas get cooled it starts expanding hence volume increases.

Aish. said: (Jul 4, 2019)  
Yes, I agree @Karthick Ravi.

Amit said: (Nov 11, 2019)  
Yes, @karthick, but here the condition is given of isobaric cooling so D option is correct.

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