When a column of air in the chimney reverses its direction. DROP FIRE - A fire started by flaming or glowing material failing from the wall or ceiling to the floor area below. Linseed, tung, soybean and castor oils are drying oils. Under certain conditions, usually involving large surface areas and insulation, such as a pile of rags soaked with drying oils, spontaneous heating may occur. Nearly all endothermic compounds are unstable and decompose easily.
Explosives are usually endothermic.
The first step to recognizing arson. An example is the heat given off during the formation of carbon dioxide which is produced by the reaction of oxygen with carbon during a fire. Most exothermic compounds are stable, that is they cannot be easily decomposed. An additional facade on the front of a building applied after the original construction. A generic term.