Question

Pitot tube is used mainly for ____ measurement.

• A. Level
• B. Viscosity
• C. Fluid velocity
• D. Humidity

Hint:

Pitot Tube. Measures fluid velocity by determining the dynamic pressure (difference between stagnation and static pressure). \(P_{dynamic = \frac{1{2\rho v^2\).

Answer 1

The Correct Option is C

A Pitot tube (or Pitot-static tube) is a flow measurement instrument used to measure fluid flow velocity
It works by measuring the difference between the stagnation pressure (total pressure at a point where the fluid is brought to rest) and the static pressure (pressure of the fluid in the surrounding flow)
This pressure difference is the dynamic pressure, which is related to the fluid velocity (\(v\)) and density (\(\rho\)) by Bernoulli's principle: $$ P_{dynamic} = P_{stagnation} - P_{static} = \frac{1}{2} \rho v^2 $$ By measuring the static and stagnation pressures, the fluid velocity can be calculated
Pitot tubes are widely used in aerodynamics (e
g
, measuring airspeed of aircraft) and industrial fluid flow measurements
They are not used for measuring level, viscosity, or humidity