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Underpressure in a pot

  1. Jan 25, 2016 #1
    • Member advised to use the homework template for posts in the homework sections of PF.
    A pot is closed tightly with a lid when the temperature of the air in the pot is 80 oC. The temperature of the system then drops to 15 oC. Find the force needed to pull the lid and the pot apart. The diameter of the pot is 20 cm, and the atmospheric pressure is 1,0 bar.

    The ANSWER is F = 580 N but I dont know how to get it, I got F = Area x Pressure but so confused about the final pressure.
     
  2. jcsd
  3. Jan 25, 2016 #2
    Are you familiar with the ideal gas law?
     
  4. Jan 25, 2016 #3
    yeah right, it in Ideal Gas chapter, with nR = pV/T
     
  5. Jan 25, 2016 #4
    You can find the final pressure in the pot by using this equation.
     
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