Mohs Hardness Scale

The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science. The method of comparing hardness by seeing which minerals can scratch others, however, is of great antiquity, having been mentioned by Theophrastus in his treatise On Stones, c. 300 BC, followed by Pliny the Elder in his Naturalis Historia, c. 77 AD.
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  • Visual Maths: Accuracy in Art

    …. Making it realistic wouldn’t be hard, but it would mean creating something that would look more at home as the palace of a villain. Mohs Hardness Scale Near the end, Elsa is about to be killed with a sword stroke, but Anna gets in the way just as she turns into ice. We know she’s turned to ice, because that’s what Elsa has power over (water…

    Pete Wailes/ SEOgadget- 7 readers -
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