1. Water is heated and particles gain thermal energy, they spread out from each other.
2. This creates an 'area' of less dense water and this 'area' of water rises.
3. Less dense water hits the top of the tube and (having no further up to go) travels along the tube.
4. As the 'area' of heated water travels, thermal energy is transferred to cooler regions that it travels through.
5. As the water loses thermal energy, particles come closer together and it becomes more dense.
As it is more dense, the 'area' of water falls back down.
6. The cooler, more dense water is drawn back to the area that is being heated. This occurs due to a slight pressure difference caused by new 'areas' of water becoming less dense and rising.
* This establishes a convection current that continues until the whole volume is at the same temperature.
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