https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:is-matter-around-us-pure/x46dd29ce84a663ea:difference-between-pure-substances-and-mixtures/v/pure-substances-and-mixtures 2023-06-26T12:36:08.867767149Z Pure substances and Mixtures What is the difference between helium and air? Or iron and salt water? Let's find out! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Pure substances and Mixtures What is the difference between helium and air? Or iron and salt water? Let's find out! https://cdn.kastatic.org/ka-youtube-converted/r076_Q0xi60.mp4/r076_Q0xi60.mp4 1046 Difference between pure substances and mixtures 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 2026-04-03T18:30:01.793877038Z Pure substances and mixtures Let's solve a few problems to understand the difference between pure substances and mixtures. Aanchal Arora exercise