mixture of salt and water at 0.9% concentration
Saline Solution, often referred to as Normal Saline (NS), is a mixture of sodium chloride (salt) and water at a concentration of 0.9% (9 grams of salt per liter of water). This isotonic solution is commonly used in medical settings for intravenous hydration, wound cleaning, and as a vehicle for drug delivery because it closely matches the salt concentration in the human body, minimizing the risk of cell damage.