What happens to the velocity of air as it passes through the carburetor venturi?

As air passes through the carburetor venturi, its velocity increases while the pressure decreases. This phenomenon occurs due to the design and physics behind the venturi effect.

In a venturi, the tube narrows, which forces the same volume of air to move through a smaller area. Consequently, as the cross-sectional area decreases, the speed of the air must increase to maintain a consistent flow rate based on the principles of fluid dynamics. According to Bernoulli's principle, as the velocity of a fluid increases, its pressure decreases. This drop in pressure is crucial for the carburetor's operation, as it helps draw fuel into the air stream, mixing it for combustion in the engine.

Other options describing a decrease in velocity or constancy do not align with these principles, as they fail to account for the physical laws that govern fluid dynamics in a venturi system. Additionally, claiming that temperature increases contradicts the expected cooling effect that typically occurs when air moves through a restricted passage, thereby further supporting the increased velocity and decreased pressure scenario.