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 :

Evaporation
Vaporisation
Sublimation
Diffusion

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Physics
Ice is packed in saw dust because

Saw dust will not get melted easily.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust is poor conductor of heat.

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