Bernoulli's theorem

American  

noun

1. Statistics. law of averages.

2. Hydrodynamics. an expression of the conservation of energy in streamline flow, stating that the sum of the ratio of the pressure to the mass density, the product of the gravitational constant and the vertical height, and the square of the velocity divided by 2 are constant.

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Etymology

Origin of Bernoulli's theorem

1920–25; Bernoulli's theorem ( in def. 1 ) named after Jakob Bernoulli; Bernoulli's theorem ( in def. 2 ) named after Daniel Bernoulli

Example Sentences

But Bernoulli's theorem doesn't explain why that higher velocity on top of the wing lowers pressure.

From Salon

By far the most popular explanation of lift is Bernoulli’s theorem, a principle identified by Swiss mathematician Daniel Bernoulli in his 1738 treatise, Hydrodynamica.

From Scientific American

Although it is a fact of experience that air moves faster across a curved surface, Bernoulli’s theorem alone does not explain why this is so.

From Scientific American

The second shortcoming of Bernoulli’s theorem is that it does not say how or why the higher velocity atop the wing brings lower pressure, rather than higher pressure, along with it.

From Scientific American

Air molecules flowing atop a wing do not behave like that, but Bernoulli’s theorem does not say why not.

From Scientific American