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Hard : doesn't deform easily Tough: doesn't break easily So a pane of glass is hard but not tough. Lump of clay is tough but not hard.
by lordnacho 5y ago
Hard : doesn't deform easily
Tough: doesn't break easily
So a pane of glass is hard but not tough. Lump of clay is tough but not hard.
- pvg 5y agoThere's quite a maze of twisty definitions of these, all slightly different, both in applied and theoretical flavours: https://en.wikipedia.org/wiki/Hardness https://en.wikipedia.org/wiki/Hardness (warning: clickholes)