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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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Weightlessness In Space Information

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 The Weightlessness In Space 

Gravitational waves 



   DO YOU KNOW: THE WEIGHTLESSNESS IN SPACE


INFORMATION:

                         Space travellers  as well as objects in the spacecraft pppear to be floating. Why does this happen? though the spacecraft is a height from the surface of the earth, the value of 'g' there is zero(0). 

                           In the space station the value of 'g' is  only 11% less than it's value on the surface of the Earth. Thus, the height of a spacecraft is not the reason for their weightlessness. their weightlessness is caused by their being in the state of free fall.

                           Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is gravitational force of the Earth and therefore it is in free fall.   As the velocity of free fall does not depend on the properties of an object, the velocity of a free fall is the same for the spacecraft, the travelers and the objects in the craft. Thus, If a traveller released an object from her hand, it will remain stationary with respect to her and will appear to be weightlessness. 

what is High and low tides 

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