Question

give reason why Osmosis is called pure mechanical diffusion

Answer 1

Osmosis is the special case of diffusion involving water molecules. Water molecules move from areas of high water concentration to areas of low water concentration through a selectively permeable membrane.A selectively permeable membrane allows small, soluble molecules to pass through it, but prevents large insoluble molecules from passing through.Osmosis is the movement of water molecules through a selectively permeable membrane from higher water concentration to a lower water concentration - or - down a concentration gradient.

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