THE TERM “SOLVENT” REFERS TO A SUBSTANCE, usually a liquid, which is able to dissolve or disperse a particular substance or ingredient. Solvents are used in numerous industrial, commercial, and consumer products. Specifications for solvents and chemical intermediates (a substance with a distinct molecular composition that is produced or consumed in a chemical process) invariably include volatility parameters such as initial and final boiling points as well as boiling point range. In this chapter, solvent volatility properties and how they relate to evaporation rate will be covered.