Strømning

Strömning is a Swedish noun that denotes the act or process of flowing. It is used to describe the movement of liquids, gases or energy within a system, as well as more figurative flows such as social or cultural trends. The word stems from strömma, to flow, and is common across scientific and everyday language in Swedish.

In physics and engineering, strömning refers to the movement of a fluid through a region or across a boundary. Key concepts include the volumetric flow rate (Q), which equals the product of cross‑sectional area and average velocity (Q = A·v), and the velocity field that describes how speed and direction vary in space. Fluid motion can be laminar or turbulent, with the Reynolds number serving as an indicator of flow regime. Conservation of mass leads to the continuity equation, a fundamental principle in fluid dynamics.

In electricity, strömning describes the flow of electric charges. While the term strömning can be used to convey the process, the more common everyday term is ström, or current. The flow of charge is described by circuit theory and laws such as Ohm’s law, relating voltage, current and resistance.

In meteorology and oceanography, large‑scale strömningar include wind currents and ocean currents, driven by pressure gradients, the Coriolis effect and density differences. These flows regulate climate, weather patterns and marine transport.

In biology and medicine, strömning can refer to the movement of substances such as blood or air through organisms and organs, often described in terms of flow rates and perfusion.

Measuring strömning typically involves flow rate (m3/s) and velocity (m/s), using devices like flow meters and anemometers.