ri-science:

Can you turn sand into a liquid?

When air is bubbled through a tank of fine sand, the sand starts to behave like a liquid, meaning you can float objects in it and stir the mixture like water.

This process is called fluidisation. Although the sand starts to ‘swim’, it doesn’t actually become a liquid. It’s a solid, behaving a lot like a fluid. The air gets in between the sand particles, lubricating the whole mixture and letting the sand particles flow over each other, in a sort of two-part fluid of sand and oxygen.

Click here to watch Andy explain more.

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