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Take two beakers, one consisting of cold water and another consisting of hotwater. Now let the beaker with hot water be beaker A and another be B. Put red ink in each of the beakers. Observe both the beakers carefully.Observation- It will be observed that in beaker A the ink spreads throughout the water faster than in the case of beaker B.Conclusion- Therefore this activity shows that diffusion becomes faster with increase in temperature but is slow when there is decrease in temperature.
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It is so simple take a cooked food which is so hot and other food with modrate hot and another food which is in less temparature the smell of the 1st food will spread all over the room but the smell of the 2nd food will not spread  like the first one and there is no smell in third one 
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