What is the difference between helium and air? Or iron and salt water? Let's find out!
Practice this concept - https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:is-matter-around-us-pure/x46dd29ce84a663ea:difference-between-pure-substances-and-mixtures/e/pure-substances-and-mixtures
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