The fluid flow rate in a duct can then be estimated from:

Fluid flow rates may be measured in litres per unit time interval (second, minute, hour, etc.).

Pressure in a hydraulic system is like the voltage in an electrical system and fluid flow rate is the equivalent of current.

Knowledge of the individual fluid flow rates of a producing oil well is required to facilitate reservoir management, field development, operational control, flow assurance, and production allocation.

More precisely, GFR is the fluid flow rate between the glomerular capillaries and the Bowman's capsule:

Basic relationships are that the torque is proportional to the differential pressure and the bit rotation speed is proportional to the fluid flow rate through the motor.

Thus DVL allows for the simultaneous determination of fluid flow rates in diverse blood and lymphatic compartments and in newly formed tumor vessels.

A plant often has a control room with displays of parameters such as key temperatures, pressures, fluid flow rates and levels, operating positions of key valves, pumps and other equipment, etc.

Local conditions at the site in question that promote their formation, e.g., local bacteria action (in kidney stones) or slower fluid flow rates, a possible explanation of the majority of salivary duct calculus occurring in the submandibular salivary gland.