Complex sentence: Baricity refers to the density of a substance compared to the density of human cerebrospinal fluid and is used in general anesthesia to determine the manner in which a particular drug will spread in the intrathecal space.
Split into simpler sentences: Baricity refers to the density of a substance compared to the density of human cerebrospinal fluid. Baricity is used in general anesthesia to determine the manner in which a particular drug will spread in the intrathecal space.