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diffusion  

Definition

  • Diffusion is an enormous topic in physics, where it involves all transport processes in which matter or energy spreads spontaneously from one medium to another, primarily due to some difference between the media. This difference may be one of potential, as in the case where the media differ in temperature. [Source: Encyclopedia of Geographic Information Science; Diffusion]

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https://concepts.sagepub.com/social-science/concept/diffusion

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