Excitation energy of a water molecule © Siemens Stiftung 2018 CC BY-SA 4.0 international

Excitation energy of a water molecule

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Chart:
Water can absorb heat energy in the form of vibrations or movement of its molecules. This energy content depends on the physical state: steam contains more energy than liquid water, for example.

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2018-09-28
The material surrounding us takes on different physical states depending on pressure and temperature (in Kelvin): solid, liquid or gaseous. This also applies to water: During a phase change from solid to liquid and liquid to gas respectively the energy of the water molecules increases without the temperature rising – the diagram for water shows plateaus. The values of these plateaus are approx. 6 kJ/mol (melting heat) and approx. 40,7 kJ/mol (vaporization heat) respectively.

Information and ideas:
Ideally suited for explaining the topic of phase equilibrium.
Illustration
Chemistry; Physics
Grade 7 to 9; Grade 10 to 13
Middle/high school
Chart; Energy supply; State of aggregation; Water
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© Siemens Stiftung 2018
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