June 2019The last year's Christmas lecture of the Department of Chemistry had the topic "Water - The elixir of life and its chemistry". The picture shows an impressive example of the power of water: A bottle of colored cooking oil is gently lowered into a cylinder filled with water. Although the oil has a lower density than water, it is held in the bottle due to the larger surface tension of water (γ (H2O) = 0.073 N∙m−1 compared to (γ (oleic acid) ≈ 0,033 N∙m−1). Not before a drop of washing-up liquid is added, the oil flow upwards. (Photos by Heiko Barth (Institute for Didactics of Chemistry) and Bjoern Luerßen (Institute of Physical Chemistry), picture submitted by Bjoern Luerßen.)https://www.uni-giessen.de/en/faculties/f08/departments/physchem/janek/gallerypotm/pom2019/BdM0619.png/viewhttps://www.uni-giessen.de/@@site-logo/logo.png
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June 2019
The last year's Christmas lecture of the Department of Chemistry had the topic "Water - The elixir of life and its chemistry". The picture shows an impressive example of the power of water: A bottle of colored cooking oil is gently lowered into a cylinder filled with water. Although the oil has a lower density than water, it is held in the bottle due to the larger surface tension of water (γ (H2O) = 0.073 N∙m−1 compared to (γ (oleic acid) ≈ 0,033 N∙m−1). Not before a drop of washing-up liquid is added, the oil flow upwards. (Photos by Heiko Barth (Institute for Didactics of Chemistry) and Bjoern Luerßen (Institute of Physical Chemistry), picture submitted by Bjoern Luerßen.)
