: Visible flames often glow because of incandescent solid particles (soot) that are released during the combustion of organic materials.
: Scientifically, fire is the rapid oxidation of a fuel. This exothermic process releases heat, light, and reaction products like carbon dioxide and water vapor. Fire and Solid Materials Free burning fires - ScienceDirect.com Gratis vuur
In the context of physical sciences, is generally classified as a plasma (a state of matter consisting of ionized gas) rather than a solid. While the flames themselves are hot gases and plasma, they often contain tiny solid particles of unburned fuel, such as soot (carbon), which make the fire visible. Scientific Characteristics of Fire : Visible flames often glow because of incandescent
: Fire is not a solid, liquid, or gas in a stable sense. It is a transient state of matter—mostly hot gases and plasma —created by a chemical reaction. Fire and Solid Materials Free burning fires - ScienceDirect