Metal hardness is a property of a metal that describes the ability of a material to resist local plastic deformation.
It’s easy to assume that all metals are hard, but there are quirky ones like mercury – which is liquid at room temperature and doesn’t even have a hardness value – and sodium metals, which you can cut with a kitchen knife.
There are several different scales and systems for measuring. In this article, we provide an overview of these measurement systems.
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