![]() This all happens in slow motion because heat absorption and dissipation are fairly slow processes, and the density changes we are discussing here are very slight. Photo: An incandescent lamp makes light by passing electricity through a very thin wire filament. As it rises, it cools, making it denser and therefore heavier, so it sinks. ![]() Because the liquids have very similar densities, the formerly heavier liquid is suddenly lighter than the other liquid, so it rises. ![]() The heavier liquid absorbs the heat, and as it heats up, it expands. In a liquid motion lamp, the heat usually comes from a light bulb. Now you apply heat to the bottom of the mixture. there is a small pin sticking out the top that looks like it would press in if touched. They won't work, so you search to find two liquids that are very close in density and are insoluble. This thing is about 15cm across with a round metal body and the top looks to be screwed on with 2 flat head screws. Oil and water are insoluble in one another (that's where the expression "oil and water don't mix" comes from), but oil and water have very different densities (a volume of water weighs a lot more than the same volume of oil).
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