Mon Prof Augmenté
Ice melting into steam
Age 12 · Science
When a pure substance like water melts or boils, it takes in heat but its temperature stops rising. The temperature only goes up again once the whole change is finished.
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In the picture
- Crushed ice: water as a solid
- Ice and water mixed: melting, with temperature steady at 0 °C
- Steam rising: water vaporizing into gas
- Flat part of the graph: temperature stays constant during the change
Examples
- An ice cube in a drink keeps the drink cold while it melts.
- Water in a boiling pot stays at 100 °C even though the stove keeps heating.
Key takeaways
- During melting, freezing, vaporization and condensation, the temperature of a pure substance stays constant.
- Heat given during a change of state breaks the bonds between particles instead of raising the temperature.
Quiz: Ice melting into steam (Age 12)
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A pure substance such as water is melting. What happens to its temperature during the melting?
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When you heat a pure substance while it changes state, what does the heat do?
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A pure substance is being heated and is changing state. When does its temperature start to rise again?
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