Editing Diphthong (section)

===Length===
Languages differ in the length of diphthongs, measured in terms of [[Mora (linguistics)|morae]]. In languages with phonemically short and long vowels, diphthongs typically behave like long vowels, and are pronounced with a similar length.<ref>{{Cite journal |last=Anderson |first=Catherine |date=2018-03-15 |title=2.8 Diphthongs |url=https://pressbooks.pub/essentialsoflinguistics/chapter/2-8-diphthongs/ |journal=Pressbooks |language=en |via=Pressbooks}}</ref> In languages with only one phonemic length for pure vowels, however, diphthongs may behave like pure vowels.<ref>{{Cite journal |last=Paschen |first=Ludger |last2=Fuchs |first2=Susanne |last3=Seifart |first3=Frank |date=September 2022 |title=Final Lengthening and vowel length in 25 languages |url=https://linkinghub.elsevier.com/retrieve/pii/S0095447022000547 |journal=Journal of Phonetics |language=en |volume=94 |pages=101179 |doi=10.1016/j.wocn.2022.101179|doi-access=free }}</ref> For example, in [[Icelandic language|Icelandic]], both monophthongs and diphthongs are pronounced long before single consonants and short before most consonant clusters.

Some languages contrast '''short''' and '''long''' diphthongs. In some languages, such as [[Old English]], these behave like short and long vowels, occupying one and two [[Mora (linguistics)|morae]], respectively. Languages that contrast three quantities in diphthongs are extremely rare, but not unheard of; [[Northern Sami]] is known to contrast long, short and "finally stressed" diphthongs, the last of which are distinguished by a longer second element.<ref name="Aikio 2022">{{Cite book |last=Aikio |first=Ante |title=The Oxford Guide to the Uralic Languages |last2=Ylikoski |first2=Jussi |date=2022 |publisher=Oxford University Press |isbn=9780191821516 |editor-last=Bakró-Nagy |editor-first=Marianne |pages=147–177 |chapter=North Saami |doi=10.1093/oso/9780198767664.003.0010 |editor-last2=Laakso |editor-first2=Johanna |editor-last3=Skribnik |editor-first3=Elena}}</ref>{{rp|149}}