Why simple diffusion does not require a semi-permeable membrane?

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SUMMARY

Simple diffusion is a process where molecules move from an area of higher concentration to an area of lower concentration without the need for a semi-permeable membrane. This phenomenon occurs due to the natural kinetic energy of molecules, allowing them to spread out evenly in a given space. The discussion emphasizes that diffusion is a fundamental concept in physical chemistry, independent of membrane structures.

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why simple diffusion does not require a semi-permeable membrane?
 
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