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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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Control Measure of Water Pollution and Soil pollution

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Control Measure of Water Pollution

1) Sewage water treatment- The house hold water should be treated properly so that they become environmentally safe.

2) Do not wash clothes, vehicles, animals in water source like river, ponds.

3) Do not pour fat from cooking or any other type of fat, oil or grease down the sink.

4) Controlled use of pesticides and fertilizers in agricultural farm so that it prevents runoffs of the material into nearby water source.

5) Don't throw paints, oil or other forms of liter down the drain.

6) Use environmentally household products such as washing power, household cleaning agents and toiletries.

7)Reducing the effluent concentration of the waste in water by  waste water treatment, 
industrial in-plant process control, eliminating effluent constituents by pretreatment.

8)Each industry should have effluent treatment and sewage treatment plant.

9)The effluent is treated to precipitate and filter the dissolved solids.

Control Measure of Soil Pollution 

a)Soil erosion is controlled by a variety of forestry and farm practice, reducing deforestation and substituting chemical measure by animal wastes.

b)By using biodegradable products.

c)Don't use pesticides and herbicides in agricultural farm.

d)Don't dump motor oil the ground.

e)Industrial waste are recycled by processing them.

f)Eat organic foods that are grown without pesticides.

Soil Pollution Component

1)Pesticides- Like organochlorines and organophosphates.

2)Inorganic-Mercury, Arsenic, Nickel, Cadmium, Lead.

3)Organic Waste-Detergents, Agricultural waste, crop residues, sewage effluents.

4)Air Born Containments- Burning fuels smelting, mining.

5)Radioactive elements- Cobalt60, Strontium, uranium.
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