[問題] 硬度的知識
摩氏硬度的定義
是將兩種石頭互相劃
劃的動對方的則硬度比對方硬
而藍寶石(剛玉)的硬度 9
幾乎僅次於鑽石
於是乎我就認知美工刀是無法刮傷藍寶石的
強者我朋友不信邪
硬是拿美工刀在藍寶石上劃上幾刀
拿放大鏡一看
還是有刻痕在上面
為啥會這樣...
藍寶石的硬度有比美工刀還小嗎? 感覺不太合理....
請問各位大大
謝謝
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