![]() What was so special about the frog in last week's picture? It's levitating! This is the first observation of magnetic levitation of a living organism in a room-temperature environment! Similar patterns of the same name are also found in rocks and the chemical phenomenon has been proposed as an explanation of the geological phenomenon as well. Despite scientific efforts in the years since, we still do not know why Liesegang rings form in this way. ![]() The characteristic pattern of rings is named after the German chemist who first observed them in 1855. The concentrations of the reactants must be just right and there must be no convection in the solution for the rings to form. What is remarkable is that clear sections of gel are left between the bands of precipitate. As the second substance dissolves into the gel, bands of precipitate form as the two substances meet and react. The first substance is dissolved in a gel, while the second is added to the top or centre of the gel. This chemical phenomenon commonly occurs when a precipitate is formed in the chemical reaction between two soluble substances. ![]() Congratulations if you identified it as an example of Liesegang rings! We left you with this striking pattern before summer. ![]()
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