Answer: flux

AnswerCrossword Clue
FLUXA coming in of the tide.
fluxsubstance added to metal to aid in fusion
fluxcontinuous change
fluxto melt, also FLIX
fluxflowing
FLUXState of continual change
FLUXCoalesce
FLUXRate of energy flow
FLUXInstability
FLUXBloc Party song that flows?
FLUXContinued movement
FLUXConstant change
FLUXContinual change.
FLUXStream.
FLUXSoldering need
FLUXRiver's journey
FLUXState of change
FLUXContinual change
FLUXContinuous movement
FLUXContinuous change
FLUXState of constant change