Physics
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :

Diffusion
Vaporisation
Evaporation
Sublimation

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

None of these
Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
The material of which pipes are made contracts due to cold and so breaks

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