$Assertion :$ In a pressure cooker the water is brought to boil. The cooker is then remove from the stove. Now on removing the lid of the pressure cooker, the water starts boiling against.
$Reason :$ The impurities in water bring down its boiling point
$Reason :$ The impurities in water bring down its boiling point
AIIMS 2004, Medium
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The water starts boiling a second time because when pressure cooker cools down pressure inside gets reduced. Reduced pressure brings down the $B.P.$ of water. The reduced $B.P.$ makes the water boil a second time.
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