Nonanoic acid, also known as pelargonic acid, is a nine-carbon fatty acid with the chemical formula C9H18O2. It is a colorless liquid that has a characteristic fatty odor. This compound is found naturally in various plant oils and is used in the production of esters for flavoring and fragrance applications. In addition to its use in the food industry, nonanoic acid serves as a precursor for the synthesis of surfactants and lubricants. It is also utilized in the formulation of herbicides and has potential applications in the field of biotechnology for its antimicrobial properties.