Excitation energy of a water molecule
Image
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.
Type of media:
Image (33.8 kByte)
Last update:
2018-09-28
License:
This medium is made available under a CC BY-SA 4.0 international license.
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This medium is made available under a CC BY-SA 4.0 international license.
What does this mean?
How to reference this medium
Description:
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.
Information and ideas:
Ideally suited for explaining the topic of phase equilibrium.
Related media:
There are no other media directly related to this file.
Learning resource type:
Illustration
Subjects:
Chemistry; Physics
Grade levels:
Grade 7 to 9; Grade 10 to 13
School types:
Middle/high school
Keywords:
Chart; Energy supply; State of aggregation; Water; Energy store; Graphics; State of aggregation; Water
Bibliography:
Siemens Stiftung Media Portal
Author:
MediaHouse GmbH
Rights holder:
© Siemens Stiftung 2018