Dissolved Oxygen (D.O.) is measured in which unit?

Dissolved Oxygen (D.O.) is typically measured in milligrams per liter (mg/l) because this unit accurately reflects the concentration of oxygen that is dissolved in water. This measurement helps in assessing water quality and the health of aquatic ecosystems, as oxygen levels are critical for the survival of fish and other aquatic organisms.

Using mg/l allows for precise tracking of small quantities of oxygen in water, which is especially important since the amounts can be quite low but still essential for biological activity. Furthermore, this unit is standard in environmental science and water quality testing protocols, making it widely recognized and easily interpretable in the context of wastewater treatment and aquatic health assessments.