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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: yiyo on October 26, 2014, 01:09:47 AM

Title: question about adiabatic process of a perfect gas
Post by: yiyo on October 26, 2014, 01:09:47 AM

I would like to ask in a condition that a perfect gas expands adiabatically against a constant external pressure, if i want to find the final temperature, should i use PV=constant and VT = constant these two formulas?
Is the method same for me to find the final temperature when the perfect gas expands adiabatically and reversibly ? I would like to know if there are any differences between them. Thank you.

Title: Re: question about adiabatic process of a perfect gas
Post by: curiouscat on October 26, 2014, 01:16:45 AM

Is a perfect gas an ideal gas?

Title: Re: question about adiabatic process of a perfect gas
Post by: yiyo on October 26, 2014, 01:58:58 AM

Quote from: curiouscat on October 26, 2014, 01:16:45 AM

Is a perfect gas an ideal gas?

Yes, it is a perfect gas.

Title: Re: question about adiabatic process of a perfect gas
Post by: Borek on October 26, 2014, 03:30:56 AM

Quote from: yiyo on October 26, 2014, 01:58:58 AM

Yes, it is a perfect gas.

I think you've missed the point of the curiuoscat question. "Perfect gas" is not something that has a well known definition. You probably mean http://en.wikipedia.org/wiki/Ideal_gas - and curiouscat was trying to confirm if that's it.

Title: Re: question about adiabatic process of a perfect gas
Post by: yiyo on October 26, 2014, 03:52:56 AM

Quote from: Borek on October 26, 2014, 03:30:56 AM

Quote from: yiyo on October 26, 2014, 01:58:58 AM

Yes, it is a perfect gas.

I think you've missed the point of the curiuoscat question. "Perfect gas" is not something that has a well known definition. You probably mean http://en.wikipedia.org/wiki/Ideal_gas - and curiouscat was trying to confirm if that's it.

It is an ideal gas