[閒聊] 牙齒 跟 鑽石 差不多硬已回收
地球上最硬的是鑽石
第二硬的是牙齒
琺瑯質含有百分之九十六以上鈣、鎂、磷斗無機鹽類,硬度大大超過鋼鐵。鑽石又稱金剛
石,是自然界存在最堅硬的物質,按等級分,它的硬度被定為十,而琺瑯質的硬度是八
所以每個人身上都有二三十顆鑽石等級的物質
所以以後戒指就用牙齒打磨成鑽石形狀就好了
所以牙醫用的鑽頭 應該只能用鑽石頭了
其它物質都鑽不動牙齒
http://kids.tpml.edu.tw/sp.asp?xdurl=DR/library03_1.asp&id=27153&mp=100
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