What is described as airborne solid and liquid particulates produced during pyrolysis or combustion?

The description pertains to smoke, which is defined as a collection of airborne solid and liquid particulates that are generated during the processes of pyrolysis or combustion. When organic materials burn, they release a variety of gases and particulate matter into the air, which collectively form smoke. This smoke can consist of water vapor, unburned fuel, and other combustion byproducts, making it important for fire investigators to recognize its properties and implications in fire scenarios.

Soot, while related, specifically refers to the fine black particles produced mainly from incomplete combustion of carbon-based materials and does not encompass the liquid particulates or gases that smoke includes. Vapor refers to the gaseous state of a substance that is normally liquid or solid at room temperature, lacking the particulate aspect. Ash is the solid residue left after combustion, composed mostly of inorganic material that remains once the fuel has burned away, and it does not describe the airborne characteristics of particulates produced during pyrotechnic events. Thus, smoke is accurately characterized as encompassing the collective solid and liquid particulates airborne after pyrolysis or combustion, making it the correct answer.