Saline water to replenish body fluids can achieve a good effect of maintaining physical tension, can help the human body quickly restore physical strength, improve fatigue and exhaustion. Using saline to clean wounds can also achieve a good anti-inflammatory effect.

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Saline, a saline solution, is commonly used in physiological experiments or clinics for osmolality that is equal to that of the osmolality of the plasma of an animal or human body sodium chloride solution with an osmotic pressure equal to that of animal or human plasma. Concentration: 0.67-0.70% for amphibians, 0.85-0.9% for mammals and human beings The concentration of sodium chloride injection solution used in people's usual drip is 0.9%, which can be used as saline.

The osmotic pressure is similar to human blood, sodium content is also similar to plasma, but the content of chlorine is significantly higher than the plasma content of chlorine, so saline is just more physiological, and its use for the supply of dielectrics and to maintain the tension of the body fluids. It can also be used externally, such as when cleaning wounds or changing medicines.

Saline is also known as sterile saline. Saline is 0.9% sodium chloride aqueous solution, because its osmotic pressure value and normal human plasma, tissue fluid are roughly the same, so it can be used as rehydration (will not reduce and increase the concentration of sodium ions in the body of a normal person), as well as other medical purposes, but also commonly used for in vitro cultivation of living tissue, cells. It is the concentration of the liquid environment in which human cells are located.