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Flow (discharge) rate

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Flow (discharge) rate diagram
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The flow rate of a stream is equal to the flow velocity (speed) multiplied by the cross-sectional area of the flow. The equation Q=AV (Q=discharge rate, A=area, V=velocity) is sometimes known as the discharge equation.
Velocity
Cross-section

Flow rate
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notes
Flow rates are important for example to environmental scientists observing river flows, and to chemists and chemical engineers considering the rates of addition of reactant streams into vessels.