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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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Specific Heat Capacity and measurement of specific heat.

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Specific Heat Capacity

1)The amount of heat energy required to raise the temperature of unit mass of an object by 1 degree Celsius is called specific heat of that object.

2)The property which determined that the amount of heat absorbed is different for different objects is called specific heat capacity.

3)The specific heat capacity is denoted by letter 'c'. The SI unit of specific heat capacity is J/kg degree Celsius and CGS unit is Cal/g degree Celsius.

4)If specific heat of an object is 'c', the mass of an object is 'm' and if the temperature of objects is decreased by ΔT degree Celsius, the heat energy absorbed by the object is given by m ✕ c ✕ ΔT.

5)Similarly, if specific heat of an object is 'c', the mass of object is 'm' and the temperature of object is decreased by ΔT degree Celsius, then heat energy lost by the object is m ✕ c ✕ ΔT.

Measurement of Specific Heat

1)The specific heat of an object can be measure using mixing method for this calorimeter is used.

2)Calorimeter is used for the measurement of specific heat.

3)If a hot solid object is put in water in calorimeter, heat exchanged between hot object, water and calorimeter starts.

4)This continues till the temperature of the solid object, water and calorimeter become equal. 

5)If specific heat of water and calorimeter are known, specific heat of solid object can be calculated.
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