Question

While measuring lower fixed point, thermometer bulb must be inside the ice pieces? give reason.​

Answer 1

Explanation:

The lower fixed point ,or ice point, is the temperature of pure melting ice at normal atmospheric pressure the upper fixed point,or Steam point,is the temperature of pure boiling water at normal atmospheric pressure.

Answer 2

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While measuring lower fixed point , thermometer bulb must be inside the ice pieces because after that the mercury level falls and becomes constant at a certain point.

More info :-

fixed point :- It is the standard degree of hotness or coldness such as melting of ice or boiling point of water. This method is used to calibrate a thermometer assumes that temperature changes linearly with the thermometric property.

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