Question

explain diffusion formula​

Answer 1

Answer:

diffusion happens when the area with higher concencentration moves to the area of lower concentrated region

Explanation:

Answer 2

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where ϕ(r, t) is the density of the diffusing material at location r and time t and D(ϕ, r) is the collective diffusion coefficient for density ϕ at location r; and ∇ represents the vector differential operator del.