A small boy placed a glass tumbler full of hot milk on a table and goes out to play. When he comes back after some time and touches the milk, he finds that the milk had cooled down.State why with proper &good explanation plzz.....

When hot milk is placed on table, heat transfer from milk to surrounding will occur through conduction, convection and radiation.
Milk is cooled due to conduction of heat from glass to floor. 
Heat is transferred by convection by movement of a heated air
above it. In Radiative cooling milk loses heat by thermal radiation (I.e heat in lost in form of electromagnetic radiation as proposed by Max Planck) 

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The heat from hot milk spread on the table is transferred to the surroundings by conduction, convection and radiation.
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