# Bernoulli's principle

Bernoulli's principle
Bernoulli's principle
n.
after BERNOULLI Daniel〛
the statement that an increase in the speed of a fluid produces a decrease in pressure and a decrease in the speed produces an increase in pressure

* * *

or Bernoulli's theorem

Principle that relates pressure, velocity, and height for a nonviscous fluid with steady flow.

A consequence is that, for horizontal flow, as the speed of a fluid increases, the pressure it exerts decreases. Derived by Daniel Bernoulli (see Bernoulli family), the principle explains the lift of an airplane in motion. As the speed of the plane increases, air flows faster over the curved top of the wing than underneath. The upward pressure exerted by the air under the wing is thus greater than the pressure exerted downward above the wing, resulting in a net upward force, or lift. Race cars use the principle to keep their wheels pressed to the ground as they accelerate. A race car's spoiler
shaped like an upside-down wing, with the curved surface at the bottom
produces a net downward force.

* * *

Universalium. 2010.

### Look at other dictionaries:

• Bernoulli's principle — named for Dutch mathematician Daniel Bernoulli (1700 1782), who published it in 1738 …   Etymology dictionary

• Bernoulli's principle — n. [after BERNOULLI Daniel] the statement that an increase in the speed of a fluid produces a decrease in pressure and a decrease in the speed produces an increase in pressure …   English World dictionary

• Bernoulli's principle — This article is about Bernoulli s principle and Bernoulli s equation in fluid dynamics. For Bernoulli s Theorem (probability), see Law of large numbers. For an unrelated topic in ordinary differential equations, see Bernoulli differential… …   Wikipedia

• Bernoulli's principle — Ber·noul·li s principle lēz , ēz , .(y)ēz also Bernoulli principle n a principle in hydrodynamics: the pressure in a stream of fluid is reduced as the speed of flow is increased …   Medical dictionary

• Bernoulli's principle — noun Etymology: Daniel Bernoulli died 1782 Swiss physicist Date: 1940 a principle in hydrodynamics: the pressure in a stream of fluid is reduced as the speed of the flow is increased …   New Collegiate Dictionary

• bernoulli's principle — noun Usage: usually capitalized B Etymology: after Daniel Bernoulli : bernoulli effect …   Useful english dictionary

• Bernoulli's principle — noun The principle that in a flowing fluid, an increase in velocity happens simultaneously with decrease in pressure …   Wiktionary

• Bernoulli — can refer to: *any one or more of the Bernoulli family of Swiss mathematicians in the eighteenth century, including: ** Daniel Bernoulli (1700–1782), developer of Bernoulli s principle ** Jakob Bernoulli (1654–1705), also known as Jean or Jacques …   Wikipedia

• Bernoulli family — The Bernoullis were a family of traders and scholars from Basel, Switzerland. The founder of the family, Leon Bernoulli, immigrated to Basel from Antwerp in the Flanders in the 16th century.The Bernoulli family has produced many notable artists… …   Wikipedia

• Bernoulli effect — Ber·noul·li effect bər .nü lē , ber .nü ē , .ber .nü .(y)ē n the change in pressure observed in a fluid stream in accordance with Bernoulli s principle Ber·noul·li bər nü lē, ber nü ē, .ber nü .(y)ē Daniel (1700 1782) Swiss mathematician and… …   Medical dictionary