An example of a flammable liquid is:

Nail polish remover is categorized as a flammable liquid primarily due to its high volatile organic compound (VOC) content, which includes acetone and other solvents. These substances have low flash points, meaning they can easily ignite at room temperature when exposed to an open flame or spark. In contrast, water is not flammable and does not support combustion. Soap typically consists of fats or oils combined with an alkaline solution, which are non-flammable, while acetone itself is indeed flammable but it serves as a key ingredient in nail polish remover, making nail polish remover the more specific choice in this context. Understanding the flammability of substances is crucial for safety practices because it informs how to store and handle these materials to prevent fire hazards.