Final answer:
Specific gravity is related to the number and molecular weight of particles in urine and is used as an indicator of kidney concentration ability. Urine osmolality is a more precise measurement used to evaluate kidney concentration ability.
Step-by-step explanation:
Specific gravity is related to the number and molecular weight of particles in the urine and is used as an indicator of the concentrating ability of the kidney.
Specific gravity is a measure of the quantity of solutes per unit volume of a solution and is traditionally easier to measure than urine osmolality. Urine osmolality is a more precise measurement of the number of dissolved particles in urine and is a better indicator of the kidney's ability to concentrate or dilute urine.