Q18 Explain the following:

(a) Water pipes in colder countries often burst in winter.
(b) In winter, the water tank (or ocean) starts freezing from the surface and not from the bottom
(c) Fishes survive in ponds even when the atmospheric temperature is below 0℃ (d) A hollow glass sphere that floats with its entire volume submerged in water at 4℃ sinks when water is heated above 4℃.
(e) A glass bottle completely filled with water and tightly closed at room temperature, is likely to burst when kept in the freezer of a refrigerator.

Solution

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