# Bernoulli's law

(bər-nōō′lēz)- An expression of the conservation of energy for any incompressible flowing fluid in terms of its pressure, velocity, density, acceleration, and vertical height.
- law of large numbers

## Bernoulli's law

[bər-nōō′lēz]

- A law of fluid mechanics stating the relationship between the velocity, density, and pressure of a fluid. Mathematically, the law states that P + 12ρv2 = constant, where P is the pressure (in newtons per square meter), ρ is the density of the fluid (in kilograms per square meter), and v is the velocity (in meters per second). If no energy is added to the system, an increase in velocity is accompanied by a decrease in density and/or pressure. The law is directly related to the principle of conservation of energy. See also Bernoulli effect.
- See law of large numbers.

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The American Heritage® Science Dictionary
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