Adhesion to water. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Adhesion to water. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Take a wooden stick, pierce the cork with it. On the same stick, at a distance of one and a half centimeters from the cork, strengthen a circle of thick drawing paper. Attach a small weight to the other end of the stick. If you lower the stick treated in this way into a glass of water, then it should be immersed in water so that the water level is at the top edge of the cork. This can be easily achieved by changing the weight of the weight. Now press the wand so that the paper circle touches the surface of the water. If you take your hand away, the circle will remain stuck to the water.

Adhesion to water

The water has wetted the lower surface of the mug, and the cohesive forces between the paper and water do not allow the mug to rise, although the cork, trying to float, tries to tear it away from the water.

Author: Rabiza F.V.

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Now, researchers at the ETH Lausanne, led by Prof. Christoph Galland of the School of Basic Sciences, have found that when green laser light strikes a gold nanoantenna, its intensity locally increases to the point that it "knocks" the gold atoms out of their equilibrium position. which maintains the integrity of the overall structure. The gold nanoantenna also amplifies very weak light scattered by newly formed atomic defects, making it visible to the naked eye.

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