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The outer surface of a beaker containing ice cubes becomes wet in short while - Give scientific reason.

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Question  The outer surface of a beaker containing ice cubes becomes wet in short while. Answer  When ice cubes are placed in a beaker, ice starts melting.  The heat required for melting is absorbed from the surrounding air and also from the beaker to some extent.  Hence, the temperature of the air and beaker falls.  The capacity of air to hold water vapour depends upon the temperature of the air, and this capacity decreases as the temperature decreases.  At a certain low temperature, the surrounding air becomes saturated with water vapour present in it.  As the temperature falls further, the air is unable to hold all the water vapour.  Hence, the extra water vapour starts condensing on the cold outer surface of the beaker in the form of minute drops.  Therefore, The outer surface of the beaker containing ice cubes becomes wet in a short while.
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Water Pollution

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Water Pollution

                 Water get polluted by two main sources.

1)Man-Made Sources-

               Domestic sewage, industrial sewage, chemical discharged from industries pesticides used in agriculture, Oil spills, Radioactive wastes. 

2)Natural sources-

1) Natural calamities like flood, heavy rain.

2) Uncontrolled growth of water weeds.

3) Dead animals, animals waste.

4) Sulphur compounds after earthquake.

5) Ashes and chemicals after forest fires.

Water pollution-Components

1)Biological-

                 Algae, bacteria, viruses, parasites.

2)Inorganic-

                 Fine sand, clay, soil and precipitated salt, toxic metals like arsenic, cadmium, lead, silver, mercury.

3)Organic-

               Pesticides, Herbicides, manure or sewage waste from industries.
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