Mechanical Properties of Fluids
Class 11 · Mechanical Properties of Fluids

Venturi Effect

Pipe with throat — flow accelerates, pressure plummets. Used in flow meters.

Run simulation

Key Notes

01

Fluid speeds up through a constriction (continuity), so its pressure drops there (Bernoulli).

02

Used in carburetors, atomizers, flow meters, aspirators.

03

ΔP = ½ρ(v₂² − v₁²) > 0 between main and throat.

Formulas

Pressure drop

Throat is at lower P.

Important Points

If A₂/A₁ = 1/2, then v₂ = 2v₁ and pressure drops by 1.5 ρv₁².

Strong winds blowing past a chimney create suction that draws smoke up.

Venturi Effect notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 11 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.