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Bernoulli's Equation

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Estimated time: 3 minutes
Maharashtra State Board: Class 11

Law: Bernoulli's Theorem

Statement:

"According to this theorem, the total energy (pressure energy, potential energy and kinetic energy) per unit volume or mass of an incompressible and non-viscous fluid in steady flow through a pipe remains constant throughout the flow, provided there is no source or sink of the fluid along the length of the pipe."

Mathematical Form:

For unit volume of liquid flowing through a pipe:

\[P+\rho gh+\frac{1}{2}\rho v^2\] = constant

where:

  • P = pressure energy per unit volume
  • ρ = density of the fluid
  • g = acceleration due to gravity
  • h = height of the fluid (potential energy term)
  • v = velocity of the fluid (kinetic energy term)

Applications of Bernoulli's Theorem:

  • Speed of efflux
  • Venturi tube
  • Lifting up of aeroplane
  • Working of an atomizer
  • Blowing off of roofs by stormy wind
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