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Apparent oxygen utilisation
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<p>In <a href="/facts/Freshwater/xMP2TxwI">freshwater</a> or <a href="/facts/Marine_(ocean)/8W8lYgjD">marine</a> systems apparent oxygen utilization (AOU) is the difference between oxygen gas <a href="/facts/Oxygen_saturation/UVhwuc26">solubility</a> (i.e. the concentration at saturation) and the measured <a href="/facts/Oxygen/acyn6o8r">oxygen</a> concentration in water with the same physical and chemical properties. </p><p> A O U = [ O 2 s o l u b i l i t y ] − [ O 2 o b s e r v e d ] {\displaystyle AOU=[O_{2}\ solubility]-[O_{2}\ observed]} </p>