GCSE Combined Science (AQA)

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Boiling, Evaporating & Condensing

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Particle model of matter Changes of state and the particle model

Boiling, Evaporating & Condensing

3:20 Changing State
Spec 4.3.1.2
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  • Boiling and evaporation are processes where a liquid turns into a gas.
  • Boiling requires heat to form gas bubbles in the liquid.
  • Evaporation occurs naturally on the surface of a liquid, such as drying clothes or water in the water cycle.
  • Boiling and evaporation are changes from liquid to gaseous states.
  • Condensation is the opposite process, where a gas turns into a liquid, like rain or steam on a cold surface.
  • Boiling occurs when a liquid is heated and gains thermal energy.
  • Condensation occurs when a gas is cooled and loses thermal energy.
  • The boiling point is the temperature at which a liquid boils when heated and a gas condenses when cooled.
  • Water boils at 100 degrees Celsius, which helps define the Celsius scale.
  • Different substances have different boiling points, e.g., helium at -268.9��C and oil at 500��C.
  • Helium is a gas and oil is a liquid at room temperature due to their boiling points.
  • For exams, knowing the boiling point of water is essential, and identifying the state of a substance given its boiling point is important.

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