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The pieces of pumice stone are added to water before heating to avoid bumping of liquid when the temperature rises. So, when waterboils it releases energy in the form of bubbles. If the bubbles do not form, the water can super hot and may explode. Porous pumice stone is added to prevent bumping of water.
Dubeychandan700:
can you also give the answer of second question
yes
A glass stirring rod, glass rod, stirringrod or stir rod is a piece of laboratory equipment used to mix chemicals and liquids for laboratory purposes. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends.
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wlc
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