Scientists have demonstrated tiny boats floating upside down beneath a layer of fluid in an amazing joke of physics.
Researchers in Paris were exploring the effect of vertical tremors, which are used to suspend a layer of fluid in the middle of the air.
Not only was the layer of liquid able to float in a suspended air, but the smaller model boats floated to the bottom surface, thanks to the intense air pressure.
This counter-intuitive behavior is the result of constant vibrations, which change the forces acting on the floating object.
The ‘reverse-float’ case may have practical applications in carrying materials through liquids and separating contaminants from water.
The scenes show the gravitational-refusing physics experiment inspired by strange surrealist art, science fiction films and the Pirates of the Caribbean.
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In the example of reverse floating, plastic boats float above and below a liquid layer
In particular, ESBCI Paris research author Emmanuel Castle said the study took note when Captain Jack Sparrow’s Black Pearl was sunk upside down in the 2007 film Pirates of the Caribbean: At World’s End.
It draws inspiration from a bizarre art installation – ‘Swimming Pool’ by Leandro Earlich at the 21st Century Contemporary Art Museum, Kansawa, Japan.
“We were just playing around – we didn’t know it would work,” Fort said Defender.
‘The funny thing is, it triggers reactions from unscientific people.
‘It’s anticipation. It’s people talking about science fiction and fantasy, and it’s so awesome. ‘
A scene from Pirates of the Caribbean: At World’s End, when Captain Jack Sparrow’s Black Pearl ship sinks
Under the action of gravity, viscous liquids in a container, such as a laboratory flask, usually fall to the bottom of the vessel.
When the container is flipped upside down, the liquid will slowly fall down in thick drops, as if the paint were falling down on a wall.
But keeping the liquid in the air can be achieved by ‘potentially vertical shaking’ of the container.
Scientists already knew that at certain frequencies, the vertical vibration of a liquid in a closed container could lead to a less dense layer of air, such as a mattress.
Thanks to the vibrations, air bubbles sink in the lower half rather than up.
In their experiments, the team filled a container with a viscous liquid of glycerol and silicone oil, and used vibrating devices to vibrate the liquid vertically at high frequencies.
Another mind-blowing inspiration for the research project is Leandro Ehrlich’s swimming pool
They pumped air into the bottom of the system until the fluid began to penetrate during vibration.
The air bubbles added to the liquid sank to the bottom of the container as expected.
But small objects, weighing up to 7 grams and measuring 0.9 inches (2.5 cm) in length or diameter, floated upside down at the base where air and fluid met.
This is because the layer of air under the inverted boat and the floating liquid layer has the highest pressure because it is compressed by the weight of the liquid.
The result is that the boat is pushed upwards by the pressure at the bottom.
Holding the liquid in air in a container can be achieved by ‘extreme vertical vibration’
When that pressure meets a downward force with the downward force of gravity, the boat floats.
At all times, the boat has its own moderate force that holds it in place.
Vertical tremor floats on the surface under the levitate fluid, as if the gravity there is upside down.
Float is the force exerted by a fluid against the weight of an object immersed in a fluid.
Vladislav Sorokin of the University of Auckland and Ilya Plekman of the Russian Academy of Sciences have written that ‘abnormal behaviors of vibrating fluids are usually just a small part of the surprising phenomena that result from high frequency vibrations’, write a piece on nature.
‘[The research] Many significant phenomena arising in vibrating mechanical systems have not yet been revealed and explained, especially at the interfaces between gases and liquids. ‘
The observations made by Fortress and colleagues violate Archimedes’ principle, in which an upward floating force equal to the weight of the displaced fluid is injected into the submerged body.
The study has been published Natural.
What is the principle of Archimedes?
Archimedes’ theory, the law of physics for buoyancy, was discovered by the ancient Greek mathematician and inventor Archimedes.
Any body that is completely or partially immersed in a liquid (gas or liquid) acts with an upward, or moderate, force, the amount of which is equal to the weight of the fluid displaced by the body.
The amount of displaced fluid is equal to the volume of an object that is completely immersed in a liquid or a fraction of the volume below the surface of an object that is partially submerged in a liquid.
The weight of the displaced part of the fluid is equal to the amount of moderate force.
The floating force on a body floating in a liquid or gas is equal to the weight of the floating object and in the opposite direction – the object does not rise or sink.
For example, a launched ship will sink at sea until the weight of the water it is transferring is equal to its own weight.
When the ship is loaded, it sinks deeper and transfers more water, so the moderate amount of force is constantly applied to the weight of the ship and its cargo.