Question

give reason for for the following -
[a] the water kept in an earthern pot become wol during summer.
[b] a desert cooler cool better on a hot dry day.
[c] ice at 273 k is more effective in cooling than water at the same temperature.
[d] napthalene balls disappear without leaving any solid residue

Answer 1

b-because the sand become cool more fast on hot day.
c-because ice at 273 calvin release latent heat.
d-because it follow the sublimation process.

sorry for a i don't know the exact reason.

Answer 2

A) the earthern pot has some pores on its surface through which water keeps evaporationis to form vapours . and as the the water evaporates the water and the surroundings near it gets cooled.
B) it cools better because outside the temperature is high and as we know high the temperature more the evaporation.
C) first of all ice at 273k = 0°c which is the melting point of ice. now it is more effective because it has more latent heat than that of water.
D) napthelene balls disappear without leaving any solid residue because it undergoes sublimation which is the process of converting a solid directly into a gas..

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