I say that 'weight is the force due to gravity' - that weight is the force and gravity is the abstract concept (in college-level physics terms). Same for 'EM f

I say that 'weight is the force due to gravity' - that weight is the force and gravity is the abstract concept (in college-level physics terms). Same for 'EM force' and 'electromagnetism' Conflating the two is a type of 'metonym' that is common in every-day and journalistic speech as here. If it's obvious what aspect you mean, then it doesn't really matter.