The Leidenfrost Effect is a lovely sounding name for some very strange and nifty physics.
When you heat up a liquid, it will, eventually, boil away into a gas. Different liquids have different boiling points. But here's the weird catch: When you suddenly put a liquid in contact with something much, much hotter than its boiling point, the liquid doesn't instantly evaporate. Instead, it forms a little cushion of vapor between itself and the heat source. You can imagine it like a hovercraft moving over the surface of a lake. The cushion doesn't prevent evaporation—and it doesn't last long—but it does slow down evaporation enough that you can see the liquid moving around on the hot surface for little bit like everything is just fine and dandy.
This video was made as a promotional piece for Modernist Cuisine. The Leidenfrost Effect matters for cooking because it allows you to tell when you have successfully heated up a pan. If the temperature of the pan is above the Leidenfrost point, then you can sprinkle it with water and watch the droplets bandy about on the hot metal. In this case, though, they used liquid nitrogen.
Dip your dollar into liquid anhydrous ammonia, dry it, and repeat. The surface tension of the boiling and evaporating ammonia shrinks the bill. Caveat: It could prove difficult to use a mini-dollar and mutilating a bill may even be illegal. (Applied Science via Weird Universe)
Designer Art Donovan writes, “I’m always looking for new and unique inspiration for my lighting commissions and the latest, cutting edge scientific devices offer a boatload of great design inspiration. From the cool, new ‘James Webb Space Telescope’ to the myriad of complex details in the L.H.P.C. at Cern- it’s a cornucopia of rich imagery.”
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