Bernoulli's principle primarily describes the relationship between what two properties of fluid flow?

Bernoulli's principle is fundamentally concerned with the relationship between the speed of a fluid and its pressure. According to this principle, as the speed of a fluid increases, the pressure within the fluid decreases, and conversely, when the speed decreases, the pressure increases. This principle is derived from the conservation of energy and is applicable to incompressible, non-viscous fluid flows.

In practical terms, Bernoulli's principle helps explain various phenomena in fluid dynamics, such as how airplane wings generate lift and how carburetors work in internal combustion engines. The inverse relationship between speed and pressure highlighted by Bernoulli's principle is crucial for understanding these applications and is foundational in the fields of engineering, aerodynamics, and hydrodynamics.