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What is the Venturi effect and how does it work in a nebuliser?

A Venturi or Venturi tube is a system used to speed up the flow of fluid by constricting it in a cone-shaped tube.

As it is restricted, the fluid must increase its velocity, which reduces its pressure and produces a partial vacuum.

As fluid leaves the constriction, its pressure then increases back to pipe level.

Giovanni Battista Venturi