The act of flowing; a continuous moving on or passing by, as of a flowing stream.

A state of ongoing change.

“Languages, like our bodies, are in a continual flux.”

A chemical agent for cleaning metal prior to soldering or welding.

“It is important to use flux when soldering or oxides on the metal will prevent a good bond.”

To use flux on.

“You have to flux the joint before soldering.”

To melt.

To flow as a liquid.

Flowing; unstable; inconstant; variable.