The osmotic pressure that keeps our food from spoiling
In short: Ever wondered why salt is the ultimate ancient preservative? This video explains the physics of osmosis—the same process that makes cells explode in water—and how it works in reverse to keep meat shelf-stable.
Salt preserves meat by creating osmotic pressure through absorption. To understand this, consider a red blood cell placed in pure water: because the cell membrane is thin and semipermeable, the saltier interior pulls water in until the cell eventually bursts.
In preservation, the process works in the opposite direction. By applying salt to meat, it creates an environment where moisture is drawn out of the organic matter rather than into it. This removal of water prevents the growth of microorganisms that cause spoilage.
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- Summary by Intellect · source: Why Salt Preserves Meat
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