Chemistry
Cloud is a colloidal dispersion of

Water drops in a dispersion medium of air
Air in a dispersion medium of water
Mist in a dispersion medium of air
Fog in a dispersion medium of water

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Chemistry
The main use of salt in the diet is to

produce in small amounts the hydrochloric acid required for the digestion of food
ease the process of cooking
make the taste of food better
increase the solubility of food particles in water

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