Pressure of a gas in atmospheres at different temperatures

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SUMMARY

The forum discussion centers on predicting the temperature at which the pressure of a gas equals zero, based on measured pressures at various temperatures in °C. The data provided includes pressures of 0.50 atm at -136°C, 0.91 atm at -25°C, 1.00 atm at 0°C, 1.09 atm at 25°C, 1.37 atm at 100°C, and 2.00 atm at 273°C. Participants suggest using an absolute temperature scale (Kelvin) to plot pressure against temperature, which would help visualize the non-linear relationship and infer the zero-pressure temperature. The consensus emphasizes the importance of graphical representation in understanding gas behavior.

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A chemist measured the pressure of a gas in atmospheres at different temperatures in
°C:
Temp (°C) -136 -25 0 25 100 273
Pressure (atm) 0.50 0.91 1.00 1.09 1.37 2.00
Can you predict the temperature at which the pressure would equal zero?
 
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Its a complicated question, because the relationship between temperature and pressure in the atmosphere is not linear at all. The atmosphere has several different 'sections' as you go higher up, so the behaviour changes.
 
ok Bruce, but in your opinion, what would your prediction be and please explain how u got to ur answer.
this prob was actually posted to me by a webhosting company, i applied there for a job. so i really need to nail this.
 
never took physics, guess the physics gods are taking revenge now :-(
 
I don't think the question has anything to do with the atmosphere (which would certainly complicate things) but just that it measures the gas pressure in atmospheres.

My suggestion: Change to an absolute scale of temperature (°K instead of °C) and draw a plot of pressure vs temperature.
 
You lost me. I understand plotting, but Id still have to come up with the the temperature at which the pressure would equal zero..
 
Did you do what I suggested?
 
OH! Ah, I see you were only mentioning 'atmospheres' as a measure of the pressure. Sorry, I totally misunderstood you.
 
Honestly, I don't know how. Never took physics.
 
  • #10
Doc Al has the right idea. You should plot temperature on one axis and pressure on the other, then see what you get. From this you might be able to infer the temperature at which pressure is zero.
 
  • #11
If you do nothing else, just make a plot of pressure versus temperature and see what it looks like.

(You don't even really need to change the temperature scale, since they are proportional.)
 

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