C₉H₁₂, A colourless or light yellow liquid. It is a primary solvent for cellulose acetate and is used in textile dying. It is naturally found in petroleum and bituminous coal and its main source is from the combustion of gasoline, landfill leaching and general use of asphalt. It has a molecular weight of 120. 9 g/mol and is also known as isocumene or phenylpropane. It has a melting point of -99°C, a boiling point of 159°C, and a vapour pressure of 3. 42 mmHg at 25°C. n-propylbenzene is flammable and incompatible with strong oxidising agents. It is harmful if swallowed and is a respiratory irritant. N-Propylbenzene degrades photo-chemically with hydroxyl radicals in the atmosphere and has a half-life of 2. 7 days.