As verbs the difference between expand and scale
is that
expand is (
label) to change (something) from a smaller form and/or size to a larger one while
scale is to change the size of something whilst maintaining proportion; especially to change a process in order to produce much larger amounts of the final product or
scale can be to remove the scales of.
As a noun scale is
(obsolete) a ladder; a series of steps; a means of ascending or
scale can be part of an overlapping arrangement of many small, flat and hard pieces of keratin covering the skin of an animal, particularly a fish or reptile or
scale can be a device to measure mass or weight.