What toxic substance is a silvery liquid that emits harmful vapors when spilled?

The correct answer is mercury, which is a toxic substance that is commonly known for its silvery liquid form. Mercury is unique among metals as it is the only one that remains liquid at room temperature. When spilled, it can emit harmful vapors and poses serious health risks, particularly through inhalation or skin exposure. Exposure to mercury can lead to significant neurological and other health issues.

In the context of safety assessments in manufacturing, understanding the hazards associated with materials like mercury is essential for implementing appropriate safety measures. Proper handling, storage, and emergency protocols are crucial to minimize risks associated with mercury spills, including the use of personal protective equipment and the protocols for containing and cleaning spills to protect workers and the environment.

The other substances listed do not share the same characteristics as mercury. Asbestos is a fibrous mineral used in construction that poses serious health risks primarily through inhalation of dust, not as a liquid form. Silver, while a metal, does not exist in a liquid state at room temperature and is not considered toxic in the same hazardous way as mercury. Cordite is a type of smokeless propellant and does not present the same toxic vapor risks when spilled.