effervescence (n.) Look up effervescence at Dictionary.com
1650s, "the action of boiling up," from French effervescence (1640s), from Latin effervescentem, present participle of effervescere "to boil up, boil over," from assimilated form of ex "out" (see ex-) + fervescere "begin to boil," from fervere "be hot, boil" (see brew (v.)). Figurative sense of "liveliness" is from 1748. Related: Effervescency.