摩爾
摩爾係個表示物質數量嘅量度單位，亦係七個國際單位制嘅基本單位之一，符號㏖。
1摩爾物質裡面所含嘅粒子數等於喺12克碳-12（）裏面嘅原子數目，爾個數等於阿伏加德羅常數嘅數值。
用摩爾做單位嘅時候，一定要交代清楚所講嘅粒子係乜。例如，「一摩爾氧」係無意義嘅，一定要講清楚係一摩爾氧原子定係一摩爾氧分子。
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