Flow measurement
quantification of bulk fluid movement
Flow measurement is the quantification of bulk fluid movement. Flow can be measured using devices called flowmeters in various ways.
Volumetric flow meters quantity volumetric flow rate while mass flow meters quantify mass flow rates.
The common types of flowmeters with industrial applications are listed below:
Obstruction type (differential pressure or variable area)
Inferential (turbine type)
Electromagnetic
Positive-displacement flowmeters, which accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.
Fluid dynamic (vortex shedding)
Anemometer
Ultrasonic flow meter
Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.
Kinds and units of measurement
Both gas and liquid flow can be measured in physical quantities of kind volumetric flow rate or mass flow rates, with respective SI units such as cubic meters per second or kilograms per second, respectively. These measurements are related by the material's density. The density of a liquid is almost independent of conditions.
“Flow measurement” enters the record as quantification of bulk fluid movement. Crown Archives preserves that source wording while asking what Flow, measurement and quantification can confirm, complicate or overturn.
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The record creator and administrative purpose are central evidence, because official documentation reflects both action and institutional priorities. The source revision retrieved here is dated Jul 24, 2026. The linked authority identifier is Q10497232. The Library of Congress control number is sh85049289. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “Flow measurement” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.