Boat enters the upside-down: Researchers use vibrations to 'defy gravity' and make a toy vessel float underneath a levitating layer of liquid

Weird phenomenon allows light objects to float on the bottom surface of liquid

Reverse buoyancy experiment inspired by weird art and Pirates of the Caribbean

The demonstrations could have practical uses to separate liquid from pollutants


PUBLISHED: 10:39 BST, 3 September 2020 | UPDATED: 14:40 BST, 3 September 2020


캐리비안의 해적에서 영감 얻은..."뒤집힌 배가 어떻게 중력을 거스를까?"

   과학자들은 놀라운 물질 기본입자인 물리학 쿼크 속에서 공중부양을 하는 액체층 아래에서 거꾸로 떠다니는 작은 배들을 보여주었다.

파리의 연구원들은 공중에서 액체 층을 정지시키는 데 사용할 수 있는 수직 흔들림의 효과를 조사하고 있었다.

액체층은 공기 쿠션 위에 떠 있을 수 있었을 뿐만 아니라, 강한 압력 덕분에 바닥 표면에는 작은 모형 배들이 떠 있었다.

이 반직관적 움직임은 일정한 진동의 결과로, 떠다니는 물체에 작용하는 힘을 변화시킨다.

이러한 '역부유'의 경우는 액체를 통해 물질을 운반하고 물에서 오염물질을 분리하는 데 실용적인 용도가 있을 수 있다.

영상에는 괴상한 초현실주의 예술, 공상과학 영화, 캐리비안의 해적에서 영감을 얻은 중력 정의 물리학 실험이 나온다.

영화 캐리비안의 해적들의 한 장면에서 배가 뒤집히는 모습 /via youtube

코카콜라 밀크쉐이크를 상상해보셨나요? 

마법의 영상에는 돌고래 떼가...

특히 ESPCI 파리의 연구 저자 에마뉘엘 포트는 이 연구가 2007년 영화 캐리비안의 해적들의 한 장면에서 시작되었다고 말했다.('월드 엔드'에서 잭 스패로우 선장의 블랙 펄 배가 거꾸로 기울어졌을 때인)

그것은 또한 일본 가나자와에 있는 21세기 현대미술관에 있는 Leandro Erlich의 '수영장'이라는 섬뜩한 예술 설치에서 영감을 얻었다.

황기철 콘페이퍼 에디터

Ki Chul Hwang Conpaper editor curator

via youtube

edited by kcontents

Scientists have demonstrated tiny boats that float upside down underneath a levitating layer of liquid in an amazing quirk of physics. 

Researchers in Paris were investigating the effect of vertical shaking, which can be used to suspend a layer of liquid in mid-air. 

Not only was the layer of liquid able to float on a suspended cushion of air, but small model boats floated on the bottom surface, thanks to intense air pressure.

This counter-intuitive behaviour is a result of the constant vibrations, which change the forces acting on the floating object.  

This case of 'reverse-buoyancy' might have a practical uses in transporting materials through fluids and separating pollutants from water.

Footage shows the gravity-defying physics experiment, which was inspired by weird surrealist art, sci-fi films and Pirates of the Caribbean.   

Scroll down for video   

Plastic boats floating above and below a levitating liquid layer in an example of reverse buoyancy

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In particular, study author Emmanuel Fort at ESPCI Paris said the research took its cue from a scene in the 2007 film Pirates of the Caribbean: At World's End, when Captain Jack Sparrow's Black Pearl ship is tipped upside down.  

It also takes inspiration from an eerie art installation – 'Swimming Pool' by Leandro Erlich at the 21st Century Museum of Contemporary Art, Kanazawa, Japan.

'We were playing around –  we had no idea it would work,' Fort told the Guardian.  

'The fun thing is that it triggers reactions from people who aren’t scientific. 

'It’s counterintuitive. It gets people talking about science fiction and fantasy and that is very nice.' 

A scene from Pirates of the Caribbean: At World's End, when Captain Jack Sparrow's Black Pearl ship is tipped upside down

Under the action of gravity, viscous liquids in a container, such as a laboratory flask, will typically fall to the bottom of the vessel. 

Flipping the container upside down will make the liquid slowly fall to the bottom in thick drops, like paint falling down a wall.

But keeping the liquid in the air can be achieved by 'vigorous vertical shaking' of the container.  

Scientists already knew that vibrating liquid vertically at certain frequencies and in a closed container can make it levitate above a less dense layer, such as a cushion of air. 

Thanks to the vibrations, air bubbles in the lower half sink rather than rise.  

In their experiments, the team filled a container with a viscous liquid of either glycerol and silicon oil, and used shaking devices to vibrate the liquid vertically at high frequency.

Swimming Pool by Leandro Erlich, another mind-bending inspiration for the research project

Keeping liquid suspended in the air in a container can be achieved by 'vigorous vertical shaking'

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How upside-down floating boats appear to defy gravity


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