Mass flow

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Physical size
Surname Mass flow
Formula symbol
Size and
unit system
unit dimension
SI kg · s -1 M · T −1
See also: flow (physics) , volume flow

A mass flow , also known as mass throughput , is the mass of a medium that moves through a cross-section over a period of time .

The mass flow is given in kilograms per second, also per minute or hour with slow flow.

The mass flow

is calculable in fluid mechanics through


: Density of the medium in kg / m³,
: mean flow velocity in m / s,
: Cross-sectional area in m²,
: Volume flow in m³ / s,
: specific weight in N / m³ = kg / (m²s²) and
: Acceleration of gravity in m / s².

With regard to density, it should be noted that in the case of gases ( i.e. compressible media) the calculation must be expanded to include the possible changes in volume. The mean flow velocity is determined via integration , see also volume flow . To measure the flow there are different measurement methods.

Examples of mass flows: wind , exhaust gas mass flow , river , ocean current , landslide , landslide , grain flow , debris flow , pyroclastic density flow


  • Alfred Böge (Hrsg.): The technician's manual, basics and applications of mechanical engineering . 15th edition. Vieweg, Braunschweig and Wiesbaden 1999, ISBN 3-528-34053-3 .

Individual evidence

  1. ^ A b Alfred Böge Das Techniker Handbuch , p. 320.
  2. ^ Alfred Böge Das Techniker Handbuch , p. 337.
  3. ^ Alfred Böge Das Techniker Handbuch , p. 330.
  4. Holger Foysi: Measurement of volume and mass flow. (PDF; 1.8 MB) University of Siegen , April 2, 2015, accessed on November 25, 2018 .