I have a model to explain what a concept is. It is a very pragmatic one. It has three elements and they are all tainted by empirical / practical features:
a) An end
. This is the practical concern, the solution to any problem of day-to-day life that is nagging you.
b) A means
. In physics, this is the instrument with which you carry out measurements and obtain values.
c) The logical link
between the former two, the reason why you think that b) is a clue that solves a)....