Researchers from Tokyo Metropolitan University have uncovered the physics behind how foams spread on surfaces. The scientists placed balls of foam on a flat substrate and then scraped across it with a plate. They identified different patterns that strongly depended on the scraping speed, which was governed by competing physical phenomena. Their findings can be applied to all types of soft materials that need to be spread evenly on surfaces, from mayonnaise on bread to insulation on walls.
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Source: Phys.org