05-08-2022, 07:56 PM
They were also blamed for cave-ins. As with all good ancient legends, the gnome story had a grain of truth to it. The silver and nickel smelting process was complicated by high levels naturally occurring cobalt in the Schneeberg rock. And a mineral called cobaltite contains arsenic and sulfur, which could be deadly if released in an airtight mine shaft. Cobalt, the elemental metal, was first isolated and named in 1735 by the Swedish chemist Georg Brandt, an early critic of alchemy and probably not a fan of gnomes, either. The Cobalt Institute says that pottery and glass containing cobalt-based glazes have been recovered from Egyptian tombs dating back at least 2,600 years. And the famous blue Chinese porcelain from the Tang (600-900 C.E.). A host of other hues - mazarine blue, willow blue, blue-black - can be made by combining cobalt oxide with other minerals. Small amounts of blue cobalt hues are also used as a "decolorizer" to cancel out yellowish hints in glass from iron contamination. 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. premier league table
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