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 ________ _____ ________ _________ _____ ______ ___ __________.
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_______ ___ _____ _________ ________ ________ ______ _____ ____.
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______ ____ _______ ___ _______ ____ __________ ________ __________.
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______ _________ __________ ______ ___.
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Starting with the general form of transport equation, obtain the diffusion equation$
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