If Si is the average salt content of the incoming seawater and So is the average salt content of the exiting surface water in an estuary, the fresh water in the exiting mixed water is ______.

If Si is the average salt content of the incoming seawater and So is the average salt content of the existing surface water in an estuary, the fresh water in the exiting mixed water is (Si - So)/Si.

What is salt content?

Salt, commonly known as sodium chloride, is composed of roughly 40% sodium and 60% chloride.
It is used to flavor food and as a binder and stabilizer.
It also serves as a food preservative since germs cannot live in the presence of a high concentration of salt.
It is often determined by ashing the meal at 500°C and then estimating the sodium content by spectrophotometry, using its distinctive light emission or absorbance in a flame (AAS, ICP, or flame photometer).

(Si - So)/Si is the fresh water in the existing mixed water.

Therefore, if Si is the average salt content of the incoming seawater and So is the average salt content of the existing surface water in an estuary, the fresh water in the exiting mixed water is (Si - So)/Si.

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