Which statement best describes the Bernoulli principle in the context of nebulization and airway therapy?

Which statement best describes the Bernoulli principle in the context of nebulization and airway therapy?

• A. As the speed of a fluid increases, pressure increases.
• B. As the speed of a fluid increases, pressure decreases.
• C. Pressure is independent of velocity in a fluid.
• D. It only applies to solids, not fluids.

Answer: (B)

Bernoulli's principle tells us that in steady, incompressible flow, faster-moving fluid has lower static pressure. In nebulization, compressed gas speeds up dramatically as it passes through a small jet. That high velocity creates a region of lower static pressure at the jet, which pulls liquid up from the reservoir and into the jet where the fast gas shears it into fine droplets. That inverse relationship—speed up, pressure down—is what drives aerosol formation, making the statement that pressure decreases as speed increases the best description. The other ideas—pressure rising with speed, pressure independent of velocity, or applying only to solids—don’t fit how fluids behave in these devices.

Bernoulli's principle tells us that in steady, incompressible flow, faster-moving fluid has lower static pressure. In nebulization, compressed gas speeds up dramatically as it passes through a small jet. That high velocity creates a region of lower static pressure at the jet, which pulls liquid up from the reservoir and into the jet where the fast gas shears it into fine droplets. That inverse relationship—speed up, pressure down—is what drives aerosol formation, making the statement that pressure decreases as speed increases the best description. The other ideas—pressure rising with speed, pressure independent of velocity, or applying only to solids—don’t fit how fluids behave in these devices.