> Activating an electric switch causes a spark, which is kind of like a fire.
So is walking on a carpet and removing your sweater and almost anything involving fabrics and motion.
Is it really a useful definition of "fire" and "spark"? Most people think of those as different things. Fire implies oxygen, you put out fires with heavy blankets or with nitrogen gas since time immemorial. Sparks, as in tiny plasma discharges, does not require oxygen and can not be put out the same way.
There's an important distinction between "thing that happens even if you don't intend it" and "thing that happens because you intentionally caused it" (and the even more subtle distinction between "beneficial side effect of thing you intended" and "neutral/negative side effect of thing you intended").
So is walking on a carpet and removing your sweater and almost anything involving fabrics and motion.
Is it really a useful definition of "fire" and "spark"? Most people think of those as different things. Fire implies oxygen, you put out fires with heavy blankets or with nitrogen gas since time immemorial. Sparks, as in tiny plasma discharges, does not require oxygen and can not be put out the same way.