Efervescency or Effervescency: How To spell?
The word Efervescency is misspelled against Effervescency, a noun meaning "A kind of natural ebullition; that commotion of a fluid which takes place when some part of the mass flies off in a gaseous form, producing innumerable small bubbles; as, the effervescence of a carbonate with citric acid."
Effervescency has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings E & ervescency which should not be misspelled with single 'F'
Wrong Spelling:  E-f-ervescency  Correct Spelling:  E-ff-ervescency 
Explore spell check of Effervescency to spell without errors.