What are osmolarities? Osmolarity is a measure of the concentration of an ionized substance in a solution. A solution with a higher osmolarity has more dissolved solids and more water molecules than a solution with a lower osmolarity. Osmolarity is measured in milliosmoles per liter (mOsm/L). The higher the osmolarity of a solution, the more concentrated the solution is. For example, a solution with an osmolarity of 500 mOsm/L has five times the concentration of a solution with an osmolarity of 100 mOsm/L. Osmolarity is important in biology because it affects the way water moves through tissues. For example, a solution with a high osmolarity can cause water to move through the cell membrane more easily than a solution with a low osmolarity. Low-osmolarity solutions are often used to wash wounds. They cause water to move into the wound and clean it. High osmolarity solutions are used to clean deep wounds. They cause water to move out of the wound and into the surrounding area. Osmolarity is also important in medicine. For example, a solution with a high osmolarity can be used to stop blood from clotting. A solution with a low osmolarity can be used to stop blood from clotting.
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