From Latin 'effervescere' (to boil up) — 'ex-' + 'fervere' (to boil), from PIE *bhrew- (to boil, to brew).
Giving off bubbles; vivacious and enthusiastic.
From Latin effervescentem, present participle of effervescere (to boil up, to foam, to bubble over), from ex- (out, thoroughly) + fervescere (to begin to boil, inceptive form of fervēre, to be hot, to seethe), from PIE *bʰrew- (to boil, to bubble, to ferment). The same PIE root *bʰrew- gives Old English brēowan (to brew), German brauen (to brew), and Latin fervor (intense heat, passion). An effervescent personality literally boils over with energy — the metaphor travels from chemistry