In experiment to demostrate the boiling point of water state reason for following precautions.(a) the bulb of thermometer should not touch the sides of the beaker?(b) pumic stone should be added while boiling water.
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a.because then instead of reading the temperature of water at a particular instant, the reading of the temperature displayed by the thermometer will represent the temperature of the beaker..I.e. in order to prevent incorrect measurement of temperatures..
b. in order to prevent knocking
b. in order to prevent knocking
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