A Molotov cocktail consists of a glass bottle partly filled with flammable liquid, typically petrol, alcohol (methanol, ethanol, ...), or gasoline. When gasoline is used as the main ingredient, motor oil or sugar is commonly added to help the gasoline cling to the target. Put a piece of cloth dipped in oil into the bottle and ignite it. Due to small surface area of combustion, as well as a lack of air caused by the small and narrow opening, just a small flame is emitted. When thrown, however, the bottle breaks on impact, and with sudden oxygen available, the burning fuel quickly sets the target on fire in an explosive manner.
20 L Molotov Cocktail in a plastic bottle