硬度
硬度，喺材料科學度係指「固體材料抗拒永久形變嘅特性」。材料局部抵抗硬物壓入佢表面嘅能力叫做硬度。固體對外界物體入侵嘅局部抵抗能力，係比較各種材料軟硬嘅指標。由於規定咗唔同嘅測試方法，所以有唔同嘅硬度標準。各種硬度標準嘅力學含義唔同，相互之間唔可以直接換算，但可以通過試驗來對比。
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