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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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Effects of water pollution and soil pollution

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Effects of water pollution

1)Pathogenic and non pathogenic organisms are present in polluted drinking water.

2)Water born disaster such as cholera, typhoid, diarrhea, dysentery, hepatitis, polio, and 
jaundice can be caused due to pathogens.

3)Water pollution affect on aquatic life.

a) Oil pollution affect algae.

b) Reduction in dissolved oxygen can kill fishes.

c) Pesticides affect reproduction and growth of fishes.

d) Detergents cause harm to the respiratory system of fishes.

Effects of soil pollution 

1) Soil erosion retarded growth of plants/crops.

2)Nutrition deficiency.

3) Loss of fertility and productivity of soil.

4) Sewage sludge containing harmful bacteria can cause infections and diseases.

5) Radio active soil pollutants can enter into crops, animals and humans through the food chain.
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