The Molotov cocktail, also known as the petrol bomb, gasoline bomb, or Molotov bomb, or simply Molotov, is a generic name used for a variety of improvised incendiary weapons. They are frequently used by rioters due to the relative ease of production.
In its simplest form, a Molotov cocktail is a glass bottle containing petrol fuel usually with a source of ignition such as a burning cloth wick held in place by the bottle's stopper. The wick is usually soaked in alcohol or paraffin, rather than petrol.
In action the fuse is lit and the bottle hurled at a target such as a vehicle or fortification. When the bottle smashes on impact, the ensuing cloud of petrol droplets and vapor are ignited, causing an immediate fireball followed by a raging fire as the remainder of the fuel is consumed.
Other flammable liquids such as wood alcohol and turpentine have been used in place of petrol. Thickening agents such as tar, strips of tire tubing, sugar, animal blood, XPS foam, egg whites, motor oil, rubber cement, and dish soap have been added to help the burning liquid adhere to the target and create clouds of thick choking smoke.
The following is based on Fallout 3 cut content and has not been confirmed by canon sources.
According to the G.E.C.K, a Molotov was going to appear in the game. It was mentioned by Sierra Petrovita and three records for it exist in the game files, but the weapon was never completed before being cut from the game. The model file was referenced in the G.E.C.K but the actual file does not exist. There is also a sound record in the G.E.C.K for the Molotov. The third record appears to be for a thrown-type weapon, but the G.E.C.K does not recognize this record and cannot open it. A model for the cocktail does exist and can be found in the Fallout - Meshes/projectiles/molotovcocktailprojectile.nif. The cut Throwing skill also references the weapon by name.
End of information based on Fallout 3 cut content.