What is meant by 'convection' ? Explain with the help of an example. Why is it that convection cannot take place in solids ?

Explanation

The cycle of warm fluid going above cold fluid simultaneously is called convection. For example when you heat a bucket of water and put your hand in it and take out half of your hand will tell that water is hot and the other hand will tell that the water is cold. This happens because of convection. Convection can not take place in solids because their inter particle space is less compared to fluids so its impossible to happen in solids.