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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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Basic principle of first aid

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Basic principle of first aid

1)Airway:

            If the victims has difficulty in breathing the head should be held in a backward sloping position or the chin  should be raised so that the respiratory passage remains open.

2)Breathing:

                    If breathing has stopped the victim should be given artificial ventilation by mouth to mouth rescuctation.

Necessary material in First-aid box

1) Bandage strips of different size

2) Wound gauze 

3) Triangular and circular bandage 

4) Medicated cotton 

5) Hand gloves 

Objectives of First-aid box

1) Saving lives

2) Preventing deterioration of condition of victims of disaster

3) Prevent illness or any injury form becoming worse
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