Britannica
Sources used in this answer
How do convection currents heat water in a kettle?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
heat
What's the relationship between heat and temperature?
In a kettle, water is heated through a process called natural convection. This occurs because most fluids, including water, expand when heated, which causes their density to decrease.
As the water molecules near the heat source gain energy, they move faster and spread farther apart, making that portion of the water less dense and more buoyant. Consequently, this warmer, less dense water rises. As it moves upward, cooler and denser water sinks to take its place near the heat source. This continuous cycle of rising warm water and sinking cool water establishes a convection current, which promotes the uniform distribution of heat throughout the kettle.1