How to calculate the pressure inside a pressure cooker??

Question

How to calculate the pressure inside a pressure cooker??

Answer 1

Well I would measure the temperature and then look up the pressure in a saturated steam table, or one of the many online calculators, but if you want to do the calculations yourself, you might take a look at this Wikipedia article: http://en.wikipedia.org/wiki/Boiling_poi...

Answer 2

Pressure cookers are equipped with a relief valve that relieves excess steam at a 'Pre-Calculated' pressure.

The valve is often set at an internal standard pressure of 15 psig, (1atm above atmospheric pressure).

The water vapor inside the cooker must reach a pressure of around 2 atm before the valve will open to begin to relieve excess pressure.

The boiling point of water at 15psig (or about 30psia) gives it a vapor pressure of 2 atm and a boiling point of 120°C.

(The lid also has a safety relief valve set at about 3psi above the normal 15 psi in case the weighted valve sticks closed).

Answer 3

you can't as the pressure will increase, as long as heat is applied, until the relief valve lets steam out.

At the point that the relief valve lets steam out, if you know the rating of the valve, then that is the pressure inside at that time.

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