Way back in 1771, Swedish chemist Karl Wilhelm Scheele was investigating the properties of a mineral known as fluorspar (calcium fluoride). He mixed the pulverized rock with sulfuric acid and...
Have you ever wondered why tungsten light bulbs develop a black deposit as they age?聽This deposit is metallic tungsten, the same stuff that the filament is made of.聽A lightbulb produces heat and...
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