06-07-2022, 04:44 PM
Acoustic levitation allows small objects, like droplets of liquid, to float. Unless you travel into the vacuum of space, sound is all around you every day. But most of the time, you probably don't think of it as a physical presence. You hear sounds; you don't touch them. The only exceptions may be loud nightclubs, cars with window-rattling speakers and ultrasound machines that pulverize kidney stones. But even then, you most likely don't think of what you feel as sound itself, but as the vibrations that sound creates in other objects. The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float. The process can take place in normal or reduced gravity. In other words, sound can levitate objects on Earth or in gas-filled enclosures in space.|DONETSK, Ukraine, Feb 19 (Reuters) - Russia's President Vladimir Putin was set to oversee exercises by strategic nuclear missile forces on Saturday as Western leaders gathered in Munich, fearful that he could order troops massed on Ukraine's border to invade at any time. Russian-backed separatist leaders in eastern Ukraine declared a full military mobilisation, a day after ordering women and children to evacuate to Russia, citing the threat of an imminent attack by Ukrainian forces. Kyiv flatly denied the accusation and Washington said it was part of Russia's plan to create a pretext for an invasion of Ukraine. Multiple explosions could be heard on Saturday morning in the north of the separatist-controlled city of Donetsk in eastern Ukraine, a Reuters witness said. The origin was not immediately clear. Ukraine said earlier that one of its soldiers had been killed. Russia ordered the military buildup while demanding NATO stop Kyiv ever joining the alliance but says predictions it is planning to invade Ukraine are wrong and dangerous.
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