is the freezing of the moisture in humid air inside the carburetor, restricting air supply to the engine and causing it to stall. The air is brought to freezing by the chilling effect of vaporizing fuel. Carburetor icing is most likely to occur when the air temperature is between 3° and 13°C (38° to 55°F); if the ambient temperature were higher, the moisture would not freeze, and if it were lower, the absolute humidity would not provide sufficient moisture. Carburetor icing can be prevented by using a gasoline with an anti-icing additive.