Question

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 the air are seen escaping into the water.Explain the reason.

Answer 1

When the bottle is heated, bubbles of air are seen escaping into the water. This happens because the air present in glass bottle expands on heating and tries to escape out through the tube into the water.

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Answer 2

The phenomenon that is described in question happens because may be the glass appears to be empty but it is filled with air which expands on cooling and tries to escape out from the tube into water kept in beaker.