Osmolality expresses the concentration of osmotically active particles in a solution as osmoles of solute per kilogram of solvent. Unlike molarity-based measures, it stays constant when temperature changes, because it depends on mass rather than volume. In food science, osmolality matters in formulating brines, syrups, and sports drinks, where it influences water movement across cell membranes during processing and digestion. It also guides the design of oral rehydration solutions and parenteral nutrition. Measurement by freezing-point depression gives precise values, helping manufacturers control osmotic strength for product stability, texture, and physiological compatibility.