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Oxygen transfer was measured in a stirred tank bioreactor using dynamic method. The dissolved oxygen tension was found to be $80 \%$ air saturation under steady state conditions. The measured oxygen tensions at $7$ s and $17$ s were $55\%$ and $68\%$ air saturation, respectively. The volumetric mass transfer coefficient $K_{La}$ is __________ $s^{-1}$
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