A mixture is a material composed of two or more components that are physically combined and so can be present in variable proportions. Unlike a compound, the components of a mixture keep their own properties and can be separated by physical methods such as filtration or distillation. Air and salt water are mixtures, whereas pure water is a compound.

混合物是由两种或多种成分物理混合而成的物质,因而其比例可以变化。与化合物不同,混合物中的各成分保持各自的性质,并可用过滤、蒸馏等物理方法分离。空气和盐水是混合物,而纯水则是化合物。