Flux

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As flux roughly means 'rate of flow', in various contexts it means '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 you might not expect it.

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 Color_notes_-_physics,_numbers,_and_(non)linearity#Related_physics

• 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

And as a name, because it sounds vaguely cool

• Flux is a query language used by InfluxDB

• Flux capacitor]

See also:

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