摩爾者,一譯莫耳,記作mol,乃物量之單位,謂所含基本微粒之數也。萬國公制七礎之一。一摩爾當十二克碳十二( 612C_^\!}} )所含原子數,稱亞佛加厥數,記作NA、L,即六點零二乘以十之二十三次方粒子也。常用於化學。
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