Buoyant force equals the weight of displaced fluid.
Academic derivation, submerged fraction and floating/neutral/sinking comparisons.
OpenStax · BuoyancyMake room for the water you push aside.: sources & model
Load a tiny barge and watch its waterline rise along the hull. Then lower a block through a tank to connect water pressure with buoyancy.
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buoyancy-1 · content 1 · setup format 1What supports the explanation?
Density and pressure have distinct meanings and units.
Hydrostatic scope uses a fixed-density teaching liquid.
OpenStax · Fluid pressureA foil hull can be loaded and compared by displacement.
Original Teisha Rowland activity. The adapted activity below is not a seaworthiness test.
Science Buddies · Foil boatsWhat this model assumes
- Static hydrostatics with calm, incompressible liquid and no surface-tension, wave, drag or capsize model.
- Barge dry mass is 0.50 kg. The 1200 kg/m³ liquid is a hypothetical denser comparison, not a seawater recipe.
- The pressure-view block is held fully submerged; visible support supplies any force needed to prevent movement. At rim contact the dry-barge model ends.
- Archimedes’ principle: Fᵦ=ρgV_submerged. For static floating balance, mg=ρgV_submerged. A 0.6 kg sealed block displaces 0.6 L in the 1000 kg/m³ water preset. Its total size still matters: it must have enough external volume available.
- Deeper does not always mean more buoyancy: For a fully submerged fixed-volume block in uniform-density liquid, increasing depth raises top and bottom pressures together. Their difference—and the net buoyancy—stays the same. A virtual support holds the pressure-view block.
- Density and stability differ: An object’s mass divided by its external volume helps decide whether it can float under these assumptions. Remaining upright is another problem. Hull shape, center of mass, waves and flooding matter for real stability.
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Analytical reference cases, conservation or transition invariants, finite drawing commands, bounded setup parsing, discovery and route integrity are checked automatically. These checks do not establish anatomical fidelity, learner outcomes or browser/device compatibility. Independent subject review, learner trials, comprehensive accessibility review and browser video encoding checks remain pending.
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The topic card uses an AI-generated editorial illustration. It introduces the subject; it is not a validated anatomical reference or a measured landscape. The experiment’s diagrams, readouts and assumptions explain the model separately.
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