Pressure cooker at 1 atmosphere?

In summary, the conversation discussed the operating pressure of a standard pressure cooker, which is 15 psi or about 1 bar. It was questioned how water can boil at 120C with 1 bar of pressure in a pressure cooker, while the atmosphere boils it at 100C with 1 bar of pressure. The concept of gauge pressure was brought up as an explanation.
  • #1
adoion
55
0
Hi,

I just read that the operating pressure of a standard pressure cooker is 15 psi or about 1 bar and they claim that water boils at 120C or 250F at this pressure.

But atmospheric pressure is 1 bar in Paris and almost 1 bar in most countries in the world, here is a link I found http://www.engineeringtoolbox.com/boiling-point-water-d_926.html.

So please someone explain how a pressure cooker can boil its water at 120C with 1 bar of pressure and the atmosphere boils its at 100C with 1 bar of pressure. ?:) what's going on here guys?
 
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  • #2
Google "gauge pressure."
 
  • Like
Likes Doug Huffman
  • #3
All right so if it says 15 psi its actually 15 psi above atmosphere??
 
  • #4
Correct.
 
  • #5
Ok thanks man, very helpful :)
 

1. What is a pressure cooker at 1 atmosphere?

A pressure cooker at 1 atmosphere is a cooking device that uses high pressure and steam to cook food faster than traditional cooking methods. It operates at 1 atmosphere, which is equivalent to the air pressure at sea level.

2. How does a pressure cooker at 1 atmosphere work?

A pressure cooker at 1 atmosphere works by trapping steam inside a sealed pot, which increases the pressure and raises the boiling point of water. This allows food to cook at a higher temperature and in a shorter amount of time.

3. What are the benefits of using a pressure cooker at 1 atmosphere?

Using a pressure cooker at 1 atmosphere can save time and energy, as it cooks food faster than traditional methods. It also helps to retain nutrients and flavors in food, and can be used for a variety of cooking techniques such as steaming, braising, and pressure frying.

4. Are there any risks associated with using a pressure cooker at 1 atmosphere?

While pressure cookers at 1 atmosphere are generally safe to use, there is a risk of explosion if they are not used properly. It is important to carefully follow the manufacturer's instructions and never open the cooker until the pressure has been safely released.

5. What types of food can be cooked in a pressure cooker at 1 atmosphere?

A pressure cooker at 1 atmosphere can be used to cook a wide variety of foods, including meats, vegetables, grains, soups, and even desserts. However, it is not suitable for delicate foods that require precise cooking temperatures, such as fish or custards.

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