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Flow velocity measurement by a Pitot tube

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Pitot tube : Instrument for measuring flow velocity, invented by H. Pitot in France in 1728

Neglecting viscosity and compressibility of fluid,  the Bernoulli theorem is valid along a streamline.

By Bernoulli theorem,

V1^2/(2g) + p1/w + z1 = V2^2/(2g) + p2/w + z2

Since V2 = 0, p1 = wa, p2 = (h+a)w, and z1 = z2,

V1^2/(2g) + wa/w + z1 = 0/(2g) + (h+a)w/w + z2

V1 = (2gh)^(1/2)

*** Âü°í¹®Çå[References] ***

V1 = (2*g*h)^(1/2)
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