Heating curve of water: ice to steam

Choose the mass of ice, the heater power and the starting temperature. The graph shows the flat parts while it melts and boils.

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Questions students ask

Why is the heating curve flat while water boils?

The energy is used to separate the particles (latent heat), not to raise the temperature.

Why does boiling take longer than melting?

The specific latent heat of vaporisation of water (2260 kJ/kg) is much larger than that of fusion (334 kJ/kg).

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