https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:fluids/xf557a762645cccc5:untitled-354/v/fluids-and-density 2025-04-01T12:37:05.24852406Z Fluids and density A fluid is a substance that has no fixed shape. Fluids include liquids and gases. Fluids can be characterized by their density, which is defined as the ratio of mass to volume. The ideal fluid model assumes a fluid is incompressible (same density everywhere) and has no viscosity (no resistance to flow). Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/f2da9968-cdb8-4dfd-99f8-0ce3a22a4353_1280_720_base.png Fluids and density A fluid is a substance that has no fixed shape. Fluids include liquids and gases. Fluids can be characterized by their density, which is defined as the ratio of mass to volume. The ideal fluid model assumes a fluid is incompressible (same density everywhere) and has no viscosity (no resistance to flow). https://cdn.kastatic.org/ka-youtube-converted/AJxYCosjRH0.mp4/AJxYCosjRH0.mp4 791 Floating and sinking https://www.khanacademy.org/science/grade-8-science-snc-aligned/xa9b0f40dbc1bb08e:force-and-pressure/xa9b0f40dbc1bb08e:floating-and-sinking-with-reference-to-density/v/why-do-objects-float-ur 2025-08-08T00:50:08.705567982Z Why do objects float? Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Why do objects float? Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/WH6AYyfzJM8.mp4/WH6AYyfzJM8.mp4 172 Floating and sinking https://www.khanacademy.org/science/biology/water-acids-and-bases/water-as-a-solid-liquid-and-gas/v/liquid-water-denser-than-solid-water-ice 2021-06-17T20:38:53Z Liquid water denser than solid water (ice) Water less dense as ice. Why lakes don't freeze solid. video https://cdn.kastatic.org/googleusercontent/hITksTsFaBcXYs6i8Zy9sBDhdqMk8WP9IN_VpWlhNf2NOig1qSfzcYQ8NZa78wuKfkwi6e_f1cZ_uGGP-ykIQ8k Liquid water denser than solid water (ice) Water less dense as ice. Why lakes don't freeze solid. https://cdn.kastatic.org/ka-youtube-converted/Y3ATc9he254.mp4/Y3ATc9he254.mp4 343 Floating and sinking https://www.khanacademy.org/science/grade-8-science-snc-aligned/xa9b0f40dbc1bb08e:force-and-pressure/xa9b0f40dbc1bb08e:floating-and-sinking-with-reference-to-density/v/condition-for-floating-ur 2025-08-08T00:50:08.705567982Z Condition for floating Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Condition for floating Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/Z3-U57XA2r0.mp4/Z3-U57XA2r0.mp4 673 Floating and sinking https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-density-and-condition-for-floating/e/predict-if-an-object-floats-or-sinks 2026-04-07T09:22:30.618598699Z Condition of floating Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/grade-8-science-snc-aligned/xa9b0f40dbc1bb08e:force-and-pressure/xa9b0f40dbc1bb08e:floating-and-sinking-with-reference-to-density/v/floats-and-sinks-ur 2025-08-08T00:50:08.705567982Z Floats and Sinks Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Floats and Sinks Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/AYegm_wO-4M.mp4/AYegm_wO-4M.mp4 63 Floating and sinking