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.