Density depending on temperature © Siemens Stiftung 2018 CC BY-SA 4.0 international

Density depending on temperature

Image

Chart:
Density-temperature structure of water compared with benzol; comparison shows the density anomaly of water.

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2018-10-05
Most substances have a continuous trend: the higher the temperature, the lower its density. In phase transitions (gas –> liquid –> solid) the density changes drastically in this temperature range. Water however has a density change at its freezing point. The density does not increase as one would generally expect but drops. The graphic shows the density-temperature behavior of "normal" substances (here benzol) as a contrast.

Information and ideas:
What could cause this behavior?
What practical importance does this anomaly of water have?
Illustration
Chemistry; Physics
Grade 7 to 9; Grade 10 to 13
Middle/high school
Chart; Energy supply; State of aggregation
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© Siemens Stiftung 2018
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