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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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What is Dew point, Humidity and Relative Humidity

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Dew point and Humidity 

1)The presence of water vapor in air moist. The moisture in atmosphere is called Humidity.

2)For a given volume of air, at a specific temperature, there is limit on how much water vapor the air can contain. If the amount exceeds this limit, The excess vapor converts into water droplets.

3)When air contains maximum possible water vapor, the air is said to be saturated with vapor at that temperature. 

4)If air temperature is low, it will need less vapor to saturate in the air.

5)If the vapor contained in the air is less than the maximum limit, then the air is said to be unsaturated.

Relative Humidity

1)Ratio of actual mass of vapor content in the air for a given volume and temperature to that required to make the air saturated with vapor at that temperature is called Relative Humidity.

2)Relative Humidity at dew point is 100%.

3)If Relative Humidity is more than 60%, we fell that the air is humid.

4)If Relative Humidity is less than 60%, we fell that the air is dry.

Dew point temperature

Suppose unsaturated air at a certain temperature is taken and its temperature is decreased, a temperature is reached at which the air becomes saturated with vapor. This temperature is called dew point temperature.
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