The invisible movement of molecules that sustains all life
In short: This video explores the fundamental principles of diffusion and osmosis through practical demonstrations. You will see how molecules move across gradients and how different concentrations of sucrose physically alter the structure of a potato.
Paul Andersen breaks down the mechanics of passive transport, beginning with a conceptual overview of how substances move from areas of high concentration to low concentration. The video features a specific diffusion demonstration to visualize these molecular movements over time.
The lesson then transitions into osmosis—the diffusion of water across semi-permeable membranes. By observing potatoes placed in varying molarities of sucrose, the lab illustrates how osmotic pressure can cause cells to shrink or swell depending on the surrounding environment.
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Sources
- Summary by Intellect · source: AP Biology Lab 1: Diffusion and Osmosis
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