effervesce (verb) - to emit small bubbles of gas or foam; to bubble forth; to be lively or vivacious [ef-er-ves]
BREAKDOWN: EF- (out) + FERV- (bubble) + -ESCE (to do)
effervescence is the act of bubbling up; spontaneous liveliness
effervescent means bubbly; producing bubbles
“Pleasure, that immortal essence, the beauteous bead sparkling in the cup, effervesces soon and subsides.” —Amos Bronson Alcott