Correct spelling, explanation: volume is based on the French word written the same way, but the very origin of the word traces back to the Latin volumen. This is the most important thing when we consider the spelling of the word. Volume is a word that is true to its origins, still very similar to its original form, and perfectly adjusted to the English vocabulary.

Definition of volume:
noun
1. a book or journal which is a part of a series
“Harry Potter and the Philosopher’s Stone” is the first volume of the Harry Potter series.
2. the amount of space something takes up
During math classes, we had to calculate the volume of a cube in cubic meters.
3. the level of loudness
Each time I listen to rock, my mom comes into my room and asks me to keep the volume down.

Idioms with volume:
speak volumes – something is proof of a person’s qualities or says a lot about a situation.
The fact that so many people came to visit her on her birthday speaks volumes about how widely liked she was.

Incorrect spelling, explanation: volumn is a misspelling of the word volume, based on the Latin volumen, which lost its ending n. As you can see, the e was in place even in the earliest form of this word. What is even more important: the e at the end is necessary to stay true to the pronunciation, and to create proper derivations of the word. Try adding s to volumn and you can see how drastically it changes the pronunciation, and it should help you remember that volume is the proper spelling.

Incorrect spelling

Incorrect spelling

Incorrect spelling