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. 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. Collectively, the colors of the visible light spectrum create white light, which is what our eye perceives when we see sunlight. ![]() Now you apply heat to the bottom of the mixture. They won't work, so you search to find two liquids that are very close in density and are insoluble. A neon lamp is a sealed glass tube filled with neon gas, which is one of the so-called 'noble' (inert or unreactive) gases on the far right of the Periodic Table. It's high up in the table, which means it has small, light atoms. 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). How neon lamps work Artwork: The periodic table of elements showing the position of the noble gas neon.
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