Topic: buoyancy

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The Mystery of the Upside-Down Catfish

Normally, an upside-down fish in your tank is bad news. As in, it’s time for a new goldfish. That’s because most fish have an internal air sac called a swim bladder that allows them to control their buoyancy and or...

Liquid Sand Hot Tub: Making a giant fluidized bed of sand

When air is pumped through sand in just the right way, the sand begins to behave a lot like a fluid. As air escapes between the sand particles, items placed in the sand will begin to float. Others will sink. And when ...

Surface tension and The Cheerios Effect

Ever notice how cereal clumps up in your bowl, or how cereal sticks to the edges of the bowl? Bubbles in beverages do the same thing. You've probably seen this surface tension and buoyancy at work, but did you know th...

Hot & Cold Water Science Experiment – HooplaKidzLab

With two matching jars, red and blue food coloring, some hot and cold water, an index card, and a dish or baking pan, you can observe how the different densities of hot and cold water behave. This experiment by Hoopla...

Aluminum foil boat floating on a sulfur hexafluoride sea

It’s not magic. It’s science! Sulfur hexafluoride (SF6) is a colorless, odorless gas that is more dense than air at 6.12 g/L (at sea level). This density is why you can pour it into a glass container ...

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