我所说的元素，是指某些原始而简单的、或完全未混合的物体；它们不由任何其他物体或彼此构成，是所有所谓完全混合体直接组成和最终分解为之的成分。
I mean by Elements certain primitive and simple, or perfectly unmingled bodies; which not being made of any other bodies, or of one another, are the ingredients of which all those called perfectly mixt bodies are immediately compounded, and into which they are ultimately resolved.
科学家
罗伯特·波义耳
1627年生于爱尔兰的自然哲学家、化学家。以表明气体体积与压力成反比关系的"波义耳定律"闻名。在著作《怀疑的化学家》中批判了亚里士多德的四元素说，将元素重新定义为可通过实验确认的物质。是将近代化学从炼金术中分离出来的先驱。
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出处: The Sceptical Chymist (1661)Verified