Abstract
It is customary to measure gas flow Q in Torr liter/sec and to calculate the pressure distribution in a system by using the relations Q=CΔP and Q=SP (C conductance, S pumping speed, P pressure). This requires that Q be the same everywhere in the system. If the temperature varies locally, Q varies also but the particle flow (molecules/sec) remains constant throughout. An analogous procedure based on the particle flow is proposed for systems with local temperature variations, and a particle conductance and particle speed are substituted for conductance and pumping speed. Examples are given to illustrate the method.
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