What is the pressure of nitrogen when cooled to -5oC?

AI Thread Summary
The discussion revolves around calculating the pressure of nitrogen in a cylinder after it cools from 25°C to -5°C. The initial pressure is 200 BAR at 25°C, which is converted to Kelvin for the calculations. Using the ideal gas law, the correct formula P1/T1 = P2/T2 is applied, leading to a final pressure of approximately 180 BAR after cooling. Participants confirm the calculations and affirm the use of the relevant equation. The thread emphasizes the importance of proper unit conversion and application of gas laws in solving pressure changes.
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Homework Statement



A cylinder of nitrogen is pressurised to 200 BAR at 25oC
The cylinder is left to cool outside on a winters day to –5oC

What is the pressure of the Nitrogen once it has cooled?



Homework Equations



P1/T1=P2/T2 ?


The Attempt at a Solution



25+273 = 298 Kelvin. 273-5=268 Kelvin.

200/298=0.6711409396

0.6711409396 x 268 = 179 BAR ?

Have i used the relevant equation? Going through some practice questions but can't find the solutions. doh.

cheers
 
Physics news on Phys.org
You would normally just do
200 * 268/298 = 180Bar

Yes you are correct.
 

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