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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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Three aspects of disaster which are important for common citizens

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Three aspects of disaster which are important for common citizens

1)Phase of emergency: 

                               Maximum lives can be saved by human being during this phase only. Various actions like search and rescue operations, medical assistance, first aid, restoring communications services, removing the people form affected area. Gravity of disaster can be estimated in this phase only.

2)Transitional phase:

1)Rehabilitation of the victims is important aspects of this phase.

2)After the subsidence of any type of disaster, rehabilitation work is started in this phase.

3)It includes clearing of debris restoring water supply, repairing roads etc. which bring normalcy in public life. 

4)Generally, different institutes offer the monetary and other type of help to such people. 

3)Reconstruction phase:

1)This is highly complicated phase. This phase begins in transitional phase.

2)People reconstruct their buildings and facilities like roads and water supply are restored. 

3)Farming practice are restarted. However it takes longtime for reconstruction.
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