Physics
Explain the following:
A cement floor is laid in small pieces with gaps in between.
Related Questions
Explain the following:
Gaps are left between the successive rails on a railway track.
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.
Why is one end of a steel girder in a bridge kept on rollers instead of fixing it in a pillar?
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.