Water molecules absorb heat, they move faster and farther apart, then change to a gas, spread out, and form bubbles.
What is boiling?
Boiling is termed as a phase transition from a liquid to a gas that occurs when a liquid reaches its boiling point.
Boiling water causes a physical change rather than a chemical change. The links between water molecules disintegrate, allowing it to transition from a liquid to a gas.
When water is boiled, the heat energy is transmitted to the water molecules, which accelerate their movement. The molecules eventually have too much energy to remain united as a liquid. When this happens, gaseous water vapor molecules form, which float to the surface as bubbles and travel through the air.
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