https://www.khanacademy.org/science/mh-class-7-science-revision-course/x16e69e7a3344a1ee:week-3/x16e69e7a3344a1ee:untitled-320/v/slow-and-fast-changes 2024-04-06T07:44:39.644882865Z Slow and fast changes Some changes are slow and some are fast. Let's look at some examples for each of them! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Slow and fast changes Some changes are slow and some are fast. Let's look at some examples for each of them! https://cdn.kastatic.org/ka-youtube-converted/olDfJyEQtOA.mp4/olDfJyEQtOA.mp4 247 Changes around us https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-1/x017c12e57b64cfa8:changes-in-neigbourhood/v/reversible-and-irreversible-changes 2023-06-26T03:56:33.129173029Z Reversible and irreversible changes Some changes can be reversed, while some can't be. Let's look at examples of the same! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Reversible and irreversible changes Some changes can be reversed, while some can't be. Let's look at examples of the same! https://cdn.kastatic.org/ka-youtube-converted/Sb2bFbdG56c.mp4/Sb2bFbdG56c.mp4 125 Changes around us https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-1/x017c12e57b64cfa8:changes-in-neigbourhood/v/regular-and-irregular-changes 2023-06-26T03:56:33.129173029Z Regular and irregular changes Some changes happen after a definite period while some can happen at any point in time. Let's look at examples for the same! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Regular and irregular changes Some changes happen after a definite period while some can happen at any point in time. Let's look at examples for the same! https://cdn.kastatic.org/ka-youtube-converted/CUkzffnYhPw.mp4/CUkzffnYhPw.mp4 72 Changes around us https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-1/x017c12e57b64cfa8:changes-in-neigbourhood/v/controlled-and-uncontrolled-changes 2023-06-26T03:56:33.129173029Z Controlled and uncontrolled changes Some changes can be controlled by us while some can't. Let's look at some examples of the same! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Controlled and uncontrolled changes Some changes can be controlled by us while some can't. Let's look at some examples of the same! https://cdn.kastatic.org/ka-youtube-converted/S3smy9p2iXk.mp4/S3smy9p2iXk.mp4 72 Changes around us https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-1/x017c12e57b64cfa8:changes-in-neigbourhood/e/rapid-and-slow-changes 2026-04-09T13:10:38.304888012Z Types of changes LO1: Types of changes - Fast and slow changes - Physical and chemical changes - Natural and artificial changes/ Controlled and Uncontrolled changes - Reversible and irreversible changes/ Regular and irregular changes.  Revathi exercise https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-1/x017c12e57b64cfa8:changes-in-neigbourhood/e/energy-required-during-changes 2026-02-26T09:10:46.921543588Z Energy required during changes Let's see how energy is involved in different types of changes. Revathi exercise https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:is-matter-around-us-pure/x46dd29ce84a663ea:methods-to-separate-the-components-of-a-mixture/v/evaporation-is-matter-around-us-pure 2025-05-17T07:42:26.597170414Z Evaporation How to separate dissolved salt from water? We don't need heavy scientific equipment. This is something you can try at home, but safely! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Evaporation How to separate dissolved salt from water? We don't need heavy scientific equipment. This is something you can try at home, but safely! https://cdn.kastatic.org/ka-youtube-converted/-h5qOLU6jWI.mp4/-h5qOLU6jWI.mp4 194 Changes around us https://www.khanacademy.org/science/revision-up-science-class-6-full-term/x00110b31861f2508:week-3/x00110b31861f2508:a-journey-through-states-of-water/v/condensation-in 2025-08-04T03:40:27.529859546Z Condensation Ever wondered why dew forms on grass or fog drifts over lakes? In this video, we’ll uncover condensation: what it is, how water vapour cools into droplets, and real-life examples like morning dew and foggy days. Learn the step-by-step mechanism and why condensation shapes weather and our world. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Condensation Ever wondered why dew forms on grass or fog drifts over lakes? In this video, we’ll uncover condensation: what it is, how water vapour cools into droplets, and real-life examples like morning dew and foggy days. Learn the step-by-step mechanism and why condensation shapes weather and our world. https://cdn.kastatic.org/ka-youtube-converted/t2H9fbmzwjM.mp4/t2H9fbmzwjM.mp4 302 Changes around us https://www.khanacademy.org/science/revision-up-science-class-6-full-term/x00110b31861f2508:week-3/x00110b31861f2508:a-journey-through-states-of-water/e/evaporation-and-condensation 2026-04-07T23:36:17.218592739Z Evaporation and Condensation In this exercise, you’ll uncover the invisible adventures of water through evaporation and condensation. You’ll explore why wet clothes dry faster under a fan, how clouds form in the sky, and even why your mouth looks smoky on winter mornings! Bitasta Datta exercise