A pressure cooker is a type of pot with a very tight lid.
As the liquid in the cooker gets hot, pressure rises. Higher pressure results in a higher boiling point. Pressure cookers allow cooking at higher temperatures, which allows faster cooking.
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A stovetop pressure cooker
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A six-quart pressure cooker manufactured by Archibald Kenrick & Sons in England, circa 1890
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Super cocotte décor SEB, 1973. Aluminium body, polyamide lacquered with an embossed aluminium lid and a stainless steel stirrup. On display at the Musée gallo-romain de Fourvière, Lyon. 18/10.
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Second generation stove top pressure cooker with battery operated timer
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Instant Pot DUO pressure cooker is an example of a third generation pressure cooker and has digital control of the cooking time and heat