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What is the science behind lava lamps?

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Liquid motion lamps (which most people know as "lava lamps") have been around for decades. The theory behind a liquid motion lamp goes something like this: In the lamp you have two liquids which are: Very close in density; Insoluble in one another. read more

The trick behind a lava lamp is that the waxy compound has almost exactly the same density as the water inside the lamp, and this density changes with temperature. When the wax is cool, it is slightly more dense than the water and it sinks. read more

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Further Research

How does a lava lamp work?
science.howstuffworks.com

Lava Lamp Science Experiment
www.sciencefun.org

The Physics Of A Lava Lamp
indianapublicmedia.org