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Convection comes into play while boiling water. What happens is that the cold water at the bottom heats up from the energy from the burner, and rises up. As the hot water rises, the cold water rushes in to replace it, which results in motion in the circular fashion.
1. Boiling Water. This is the most common and relatable household example of convection. For instance, When water is heated in a kettle, thermal expansion takes place. The lower layer of the water which is hotter becomes less dense and moves upward due to buoyancy. The cooler/upper layer of the water falls below and gets heated as well.
Boiling Water: As water near the bottom of a pot is heated, it rises to the surface, creating a visible convection current. Radiators in Rooms: Warm air rises from a radiator, and cooler air moves in to replace it, creating a circulating flow.
Boiling water undergoes convection as less dense hot molecules rise through higher density cooler molecules. Hot air rises and cooler air sinks and replaces it. Convection drives global circulation in the oceans between the equators and poles.
Boiling water is an example of convection. When water is heated, the water molecules at the bottom gain energy and start to move faster, causing them to rise to the top. The cooler, denser water at the top then sinks to the bottom, where it is heated and rises again.
An example of convection that is easy to see is boiling water in a pot. You might notice turbulence around the outside edge of the pot with a flow on the top of the water towards the center. This is a prime example of convective heat transfer.
Water boiling: It is one of the most common examples of natural convection. Water boils when the water molecules near the bottom of the pot heat up, causing them to lose their density and move upwards. The colder molecules are dense which is why they move down, creating a circular flow.
2,48,152. How is Heat Transferred? Heat can travel from one place to another in several ways. The different modes of heat transfer include: Conduction. Convection. Radiation. Meanwhile, if the temperature difference exists between the two systems, heat will find a way to transfer from the higher to the lower system. What is Conduction?
Convection, process by which heat is transferred by movement of a heated fluid such as air or water. Natural convection results from the tendency of most fluids to expand when heated—i.e., to become less dense and to rise as a result of the increased buoyancy.
Once conducted to the inside, heat transfer to other parts of the pot is mostly by convection. The hotter water expands, decreases in density, and rises to transfer heat to other regions of the water, while colder water sinks to the bottom. This process keeps repeating.