Energy: Heat Energy

The video explains convection, a process occurring in liquids and gases but not in solids. It demonstrates convection through an experiment where water in a beaker is heated, causing a swirling movement as hot water rises and cooler water descends. Adding sand grains helps visualize this movement. The video also highlights convection in the atmosphere, where the sun heats the Earth's surface, causing warm air to rise and cooler air to move in.

What is the significance of the cooler upper layers of water in the convection process?

Explain how convection leads to uniform heating of water.