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Jan 30, 2013 10:52 AM

How to test a pressure cooker? (evaporation? cook a potato?)

To correct what appears to be a lack of pressure problem, I want to do a test-run tonight.

My thinking is to put 2 cups of water, attain pressure (on high-15psi), lower the heat a bit on my gas stove, and let it run for 30 minutes, then measure how much water is left.

Please take a guess as to how much water should be left? Should I lose 0.5 cups, 1 cup, 1.5 cups?

Assuming the pressure cooker performs as expected, I'd like to perform an actual cooking test: e.g. cook a whole, medium sized sweet potato and confirm that the cook times are in line with expected cook times.

It seems like I need both tests because what if I don't lose much water on the first test, but that's because it's really not under much pressure.



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  1. Stove-top pressure cookers should have an average of 3% evaporation in 10 minutes. It's easier if you weigh the cooker on a scale and pour in 10oz of water.

    Pressure cook for 10 minutes at high pressure. When finished pressure cooking, release pressure using the lever and pour the contents of the pressure cooker, and shake the condensation from the lid in a bowl on the scale. You should have lost less than an ounce.

    The math will be a lot easier that way!!

    I'm in Italy and test cookers for reviews using the metric system (1000 grams).



    P.S. Remember to follow the advice I left for you in another topic. Do not start counting pressure cooking time until the pressure signal is firm.

    1 Reply
    1. re: pazzaglia

      Will do, thanks!

      And BTW, I really appreciate your & everyone's expertise and help.