Flux

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As flux roughly means 'flow', in various contexts it means 'rate of flow' and/or 'amount of stuff happening', in a turnover sort of way.

This sense pops up in

physics,

biology (movement of chemicals, sometimes specific to metabolism),

but also physiology and a few other places.

In physics:

• Electric flux is a property of an electric field

• luminous flux is amount of visible light, radiant flux refers to any electromagnetism (verify) (see also flux in the human perception of light)

• Magnetic flux

But also:

• In metallurgy (e.g. welding) flux is about cleaning and purifying agents to keep things flowing

in welding it might refer to anything that helps keep the weld pool clean

in soldering, soldering flux is often specifically an acid that removes oxidation -- so that solder can flow more easily

'acid flux' refers to a specific type of such flux

Also as a name for some things, probably because it sounds vaguely cool

• Flux is a query language used by InfluxDB

• Flux capacitor]

See also:

• https://en.wikipedia.org/wiki/Flux_(disambiguation)