Which of the following is an example of a potential ignition source for hazardous materials?

Open flames are a clear example of a potential ignition source for hazardous materials due to their ability to produce heat and light that can ignite flammable substances. When hazardous materials are present, especially those that are volatile or have low flash points, open flames can easily lead to combustion, resulting in fire or explosions. In hazardous materials situations, it's crucial to identify and eliminate any sources of ignition to ensure safety and prevent accidents.

In comparison, water vapor has a cooling effect and does not ignite. Detergents are chemical compounds primarily used for cleaning and do not function as ignition sources. Heavy fog, while it can obscure visibility, does not provide a heat source and therefore does not present an ignition risk. Identifying and managing ignition sources is an essential part of hazardous materials response and safety protocols.