Starting with the general form of transport equation, obtain the diffusion equation$
Transport of particles or energy in a medium is described by a continuity (transport) equation expressing local conservation. Let φ(⃗r, E, t) be the particle density (or phase-space density) and J(⃗r, E, t) the corresponding flux. The general transport equation is ∂φ/∂t + ∇·J = S − L, where S and L represent ____ _______ ________ _______ ______ ___ __________ _______ ____ _________.
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What are
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