👉 A fraction fluid, often abbreviated as FF, is a standardized unit of measurement used to describe the concentration of a solution in terms of its parts per million (ppm) or parts per billion (ppb). It represents the amount of solute dissolved in a given volume of solvent, typically expressed as a ratio of the mass of the solute to the total mass of the solution. For example, a 0.5% (w/v) fraction fluid means that in 100 grams of solution, there are 5 grams of solute dissolved. This makes fraction fluids particularly useful in chemistry and environmental science for comparing the concentrations of different substances accurately and consistently.