flow

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Related to maximal expiratory flow: forced expiratory flow, forced expiratory flow rate

flow

a measurement of quantity over a specified period of time. Unlike a STOCK, which is not a function of time, a flow measures quantity passing per minute, hour, day or whatever. A common analogy is to a reservoir. The water entering and leaving the reservoir is a flow but the water actually in the reservoir at any one point in time is a stock. INCOME is a flow but WEALTH is a stock.
References in periodicals archive ?
Mechanism of reduced maximal expiratory flow with aging.
MEF75%1 sec is the maximal expiratory flow at 75% of expiratory forced vital capacity before end of expiration.
Measures included forced expiratory volume in one second (FEVi), peak expiratory flow (PEF), maximal mid expiratory flow (MMEF), maximal expiratory flow at 75%, 50% and 25% of FVC (MEF75, MEF50 and MEF25 respectively), specific airway conductance (sGAW).

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