Mon Prof Augmenté
Ice, water and mist
Age 12 · Science
A pure substance can be solid, liquid or gas, and it changes between them when it is heated or cooled. The steps are called melting, freezing, vaporization and condensation. The amount of matter, its mass, stays the same, even though the volume changes.
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In the picture
- Ice cube: the solid state, which melts into water when heated
- Glass of water: the liquid state, which freezes into ice or vaporizes into gas
- Sealed flask of mist: the gas state, which condenses back into water
- Level balance: the mass is the same in every state
Examples
- An ice cube melting in a glass on a warm day
- Steam on a bathroom mirror condensing into water droplets
Key takeaways
- Melting, freezing, vaporization and condensation change the state, not the substance.
- Mass stays the same during a change of state, but the volume can change.
Quiz: Ice, water and mist (Age 12)
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A glass of water freezes into ice. What has changed?
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Water vapour in a sealed flask cools and condenses into liquid water. What happens to the mass?
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What is the name of the change when a gas turns back into a liquid?
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