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Speaker 1: Stuff from how Stuff Works dot com Where smart Happens,
Speaker 1: Hi Marshall Brain. Liquid motion lamps, which most people know
Speaker 1: is lava lamps, have been around for decades, but have
Speaker 1: you ever wondered how they work. It's actually the same
Speaker 1: kind of thing that powers a hot air balloon. The
Speaker 1: theory behind liquid motion lamps goes something like this. Inside
Speaker 1: the lamp, you have two liquids, and these two liquids
Speaker 1: are first of all, very close in density and second
Speaker 1: insoluble in one another. Oil and water are insoluble in
Speaker 1: one another, but oil and water have very different densities.
Speaker 1: A volume of water weighs a lot more than the
Speaker 1: same volume of oil. They won't work in a lava lamp,
Speaker 1: so you search to find two liquids that are very
Speaker 1: close in density and are insoluble like oil and water.
Speaker 1: Now you apply heat to the bottom of the mixture
Speaker 1: in a liquid motion lamp. That heat usually comes from
Speaker 1: a lightbulb. The heavier liquid absorbs the heat, and as
Speaker 1: it heats up, it expands. As it expands, it becomes
Speaker 1: less dense. Because the liquids have very similar densities, The
Speaker 1: heavier liquid is suddenly lighter than the other liquid, so
Speaker 1: it rises. As it rises, it cools down, and that
Speaker 1: makes it denser and therefore heavier, So now it starts
Speaker 1: to sink. This all happens in slow motion because heat
Speaker 1: absorption is a fairly slow process, and the density changes
Speaker 1: we're talking about here are very slight. That slowness is
Speaker 1: what makes a lava lamp so cool. Do you have
Speaker 1: any ideas or suggestions for this podcast? If so, please
Speaker 1: send me an email at podcast at how stuff works
Speaker 1: dot com. For more on this and thousands of other topics,
Speaker 1: go to how stuff works dot com. Protect your organization's
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