Go Back   Physics Help Forum > Lobby > New Users

New Users New to PHF? Post up here and introduce yourself!

LinkBack Thread Tools Display Modes
Old Apr 3rd 2017, 06:23 AM   #1
Junior Member
Join Date: Apr 2017
Posts: 2
Gas concentration by ppm for an increase in pressure

Air compressed to 24 Mpa with a final Co2 concentration of 400ppm is increased in pressure to 29 Mpa from atmosphere at a initial Co2 concentration of 300 ppm, what is the final Co2 concentration in ppm?
craigmarsden12091987 is offline   Reply With Quote
Old Apr 4th 2017, 08:44 AM   #2
Senior Member
Join Date: Aug 2010
Posts: 434
PV= NRT where "P" is the pressure, "V" is the volume, "N" is the number of atoms or molecules, "R" is the "gas constant" (https://en.wikipedia.org/wiki/Gas_constant), and "T" is the temperature in Kelvins. In your problem you do not mention volume or temperature so I presume those are held constant. The only variables are P and N.
Writing $\displaystyle P_1$ and $\displaystyle N_1$ for the first, 24 Mpa, case and $\displaystyle P_2$ and $\displaystyle N_2$ for the second, 29 Mpa, case, we have $\displaystyle P_1V= N_1RT$ and $\displaystyle P_2V= N_2RT$. Dividing the first by the second, $\displaystyle \frac{P_1}{P_2}=\frac{N_1}{N_2}$.
HallsofIvy is offline   Reply With Quote
Old Apr 5th 2017, 03:05 AM   #3
Junior Member
Join Date: Apr 2017
Posts: 2
Sorry Hallsof ivy I should of made It clear, the volume remains constant, there is a very slight increase in temperature and the initial Co2 concentration was 300ppm not the 400 that I initially stated. I'm just looking for a ball park figure of Co2 concentration i.e concentration goes up, goes down or remains the same. Also this is a mixed gas, normal Air (Nitrogen, Oxygen, Co2). What ever the answer is what is the formula for working this problem out.

craigmarsden12091987 is offline   Reply With Quote

  Physics Help Forum > Lobby > New Users

concentration, gas, increase, ppm, pressure

Thread Tools
Display Modes

Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Temperature Increase due the radiation absorption Overheated Advanced Thermodynamics 0 Feb 9th 2017 03:27 PM
Electromagnet actuator increase power project Electricity and Magnetism 1 May 2nd 2016 08:11 AM
What is local linear increase? Evgenii Light and Optics 0 Aug 24th 2014 08:35 AM
concentration from emission? astrofysikern Atomic and Solid State Physics 2 Apr 28th 2010 04:15 AM
increase in temperature tanaki Thermodynamics and Fluid Mechanics 0 Dec 18th 2009 03:25 AM

Facebook Twitter Google+ RSS Feed