The answer is speed and pressure.
Bernoulli's equation relates the pressure, speed, and height of any two points (1 and 2) in a steady streamline flowing fluid of density(ρ). This equation states that the sum of the static pressure and the dynamic pressure will be constant between any two points in a closed system. Bernoulli's equation is usually written as; P₁ + (1/2)ρv₁² + ρgh₁ = P₂ + (1/2)ρv₂² + ρgh₂. Where P is the absolute pressure of the fluid, ρ is the density of the fluid, v is the linear speed, g is the acceleration due to gravity, and h is the height of the fluid above some datum.
