Here's why these letters are called vowels:
* Sound Production: Vowels are produced with an open vocal tract, allowing air to flow freely. This results in a clear, resonant sound.
* Core of Syllables: Vowels form the nucleus (the core sound) of every syllable in spoken language. They are the sounds that carry the most weight and are most easily heard.
* Uninterrupted Flow: Unlike consonants, which involve some obstruction of airflow, vowels are produced with uninterrupted airflow, making them more sonorous and carrying more musicality.
Historically, the term "vowel" likely emerged from the observation that these sounds are the most "vocal" or prominent in speech, forming the foundation of words and syllables.