The working of venturimeter is based on

• A) Torricelli's law
• B) Pascal's law
• C) Bernoulli's theorem
• D) Archimedes' principle

The working of a venturimeter is primarily based on Bernoulli's theorem. This principle explains how the pressure of a fluid decreases as its velocity increases when flowing through a constricted section of a pipe.

Key Concepts

• Bernoulli's Theorem: It states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or potential energy.
• Venturimeter Function: It measures the flow rate of a fluid by observing the pressure difference between two points in a pipe.

Why Other Options Are Incorrect

To clarify why the other options do not apply:

• Torricelli's Law: This law relates to the speed of fluid flowing out of an orifice, not directly to flow measurement in a pipe.
• Pascal's Law: It deals with pressure transmission in fluids at rest, which is not the focus of a venturimeter.
• Archimedes' Principle: This principle pertains to buoyancy and is not relevant to fluid flow measurement.

In summary, the venturimeter utilizes Bernoulli's theorem to effectively measure fluid flow by analyzing changes in pressure and velocity.