How Much Force to Open a Cooled Pot Lid?

  • Thread starter mrlac1212
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In summary: Then, you can use the formula F = Area x Pressure to calculate the force needed to pull the lid and the pot apart. In summary, to find the force needed to pull apart a pot and its lid, you can use the ideal gas law to calculate the final pressure in the pot and then use the formula F = Area x Pressure to get the answer of F = 580 N.
  • #1
mrlac1212
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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 don't know how to get it, I got F = Area x Pressure but so confused about the final pressure.
 
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  • #2
mrlac1212 said:
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 don't know how to get it, I got F = Area x Pressure but so confused about the final pressure.
Are you familiar with the ideal gas law?
 
  • #3
Chestermiller said:
Are you familiar with the ideal gas law?
yeah right, it in Ideal Gas chapter, with nR = pV/T
 
  • #4
mrlac1212 said:
yeah right, it in Ideal Gas chapter, with nR = pV/T
You can find the final pressure in the pot by using this equation.
 

Related to How Much Force to Open a Cooled Pot Lid?

1. What is underpressure in a pot?

Underpressure in a pot refers to the situation where the pressure inside a sealed pot or container is lower than the surrounding atmospheric pressure. This can be achieved by removing air or gases from the pot, creating a vacuum inside.

2. How is underpressure created in a pot?

Underpressure in a pot can be created through various methods, such as using a vacuum pump or heating the pot to create steam and then sealing it. The key is to remove air or gases from the pot, creating a lower pressure inside compared to the outside.

3. What are the benefits of cooking with underpressure in a pot?

Cooking with underpressure in a pot can help to cook food faster and more evenly. The lower pressure inside the pot also allows for lower cooking temperatures, which can help to preserve nutrients and flavors in the food.

4. Is underpressure in a pot safe?

Underpressure in a pot can be safe if proper precautions are taken. It is important to follow the manufacturer's instructions and make sure the pot is sealed properly. It is also crucial to release the pressure before opening the pot to avoid any accidents.

5. Can any type of pot be used for underpressure cooking?

Not all pots are suitable for underpressure cooking. It is recommended to use pots that are specifically designed for this purpose, with proper safety features and airtight seals. Using regular pots or containers can be dangerous and may not produce the desired results.

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