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How to Calculate Flow Rate: Step-by-Step Formula Explained

Learn how to calculate flow rate using the formula Q = A × v with clear examples for accurate fluid flow measurement.

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Video transcript

To calculate the flow rate, use the formula Q = A * v, where Q is the flow rate, A is the cross-sectional area through which the fluid is flowing, and v is the velocity of the fluid. For example, if you have a pipe with a radius of 0.5 meters and the velocity of water flowing through it is 2 meters per second, the flow rate would be Q = π (0.5)^2 2, approximately 1.57 cubic meters per second.

Questions and answers

  1. What is the formula for calculating flow rate?

    The flow rate is calculated by multiplying the cross-sectional area (A) by the velocity (v) of the fluid: Q = A × v.

  2. How do you find the cross-sectional area for flow rate calculation?

    For a circular pipe, the cross-sectional area is calculated using A = π × r², where r is the radius of the pipe.

  3. What units are used to express flow rate?

    Flow rate is typically expressed in cubic meters per second (m³/s) or liters per second (L/s), depending on the system.

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