Which of the following attributes refers to the mass or heaviness of smoke particles?

The attribute that refers to the mass or heaviness of smoke particles is density. Density is defined as mass per unit volume, and it is a crucial factor in understanding how smoke behaves in the environment. Smoke consists of various particles and gases produced during combustion, and the density of these particles can influence how they rise, disperse, and settle in a fire scenario.

In this context, understanding density helps in predicting how smoke will move within a structure during a fire, how it can affect visibility, and the potential for smoke inhalation hazards. A higher density indicates heavier smoke particles, which may not rise as high or disperse as easily, while lower density particles can remain suspended in the air for longer periods. This knowledge is essential for firefighters and emergency responders in planning their strategies for fire suppression and ensuring safety in smoke-filled environments.