具有恒定化学成分和特性、仅由一种类型粒子(如元素或化合物)组成的物质
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具有恒定化学成分和特性、仅由一种类型粒子(如元素或化合物)组成的物质
a material that has a constant chemical composition and characteristic properties, consisting of only one type of particle (e.g., an element or compound)
Water is a pure substance composed of hydrogen and oxygen.
水是由氢和氧组成的纯物质。
具有恒定化学成分和特性、仅由一种类型粒子(如元素或化合物)组成的物质
a material that has a constant chemical composition and characteristic properties, consisting of only one type of particle (e.g., an element or compound)
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