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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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It is recommended to use air tight container for storing oil for long time - Give Scientific Reason

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Question

It is recommended to use air tight container for storing oil for long time

What is Newlands' law of octaves

Answer

If edible oil is allowed to stand for a long time, it undergoes air oxidation, it becomes rancid and its smell and taste change.

Rancidity in the food stuff cooked in oil or ghee is prevented by using antioxidants.

This process of oxidation reaction of foodstuff can also be slow down by storing it in air tight container.

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