How to pronounce n in English

"the fourteenth letter of English alphabet is a vocal consonent and in allusion to its mode of formation is called the dentinasal or linguanasal consonent. Its commoner sound is that heard in ran done; but when immediately followed in the same word by the sound of g hard or k (as in single sink conquer) it usually represents the same sound as the digraph ng in sing bring etc. This is a simple but related sound and is called the gutturo-nasal consonent. See Guide to Pronunciation

"A measure of space equal to half an M (or em); an en."