flux
UK[flʌks]US[flʌks]
n
A state of continuous movement, change, or instability.
n
A substance mixed with a metal or other material to help it melt or join.
n
The rate of flow of a fluid, particles, or energy across a given area.
Etymology
The word 'flux' entered English in the late 14th century, derived from the Old French 'flux' and directly from the Latin 'fluxus', meaning "a flowing, flow". This Latin noun originates from the past participle of the verb 'fluere', which means "to flow". The core concept of flowing or fluidity has been remarkably consistent, evolving from the literal sense of physical flow to encompass abstract states of continual change and instability. The specialized use in metallurgy and physics for a substance that promotes flow or the measurement of flow rate directly extends this foundational meaning of movement and passage.
Analysis
The word 'flux' is a simplex loanword from Latin. It cannot be meaningfully segmented into smaller, independent morphemes within its current English spelling.
Examples
The political situation remained in a state of constant flux.
Borax is commonly used as a flux in soldering and welding.
Scientists measured the heat flux through the building's walls.