Physics
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.
Related Questions
Explain the following:
A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.
Explain the following:
A cement floor is laid in small pieces with gaps in between.
Why is one end of a steel girder in a bridge kept on rollers instead of fixing it in a pillar?
An iron washer is heated. State the effect on its:
(i) mass
(ii) internal diameter
(iii) external diameter and
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