Ten letters have hams; the remaining nineteen have jahr. Compare the hams letter س with ز: their places are close, but airflow and sound quality differ.
Importantly, ص is one of the hams letters and also has higher-tongue and iṭbāq qualities. Thus hams does not automatically mean a thin or feeble consonant. A letter possesses several qualities simultaneously.
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Separating jahr and hams
Ṣifāt al-Ḥurūf — Opposing Qualities and Strength Grades
Ten letters have hams; the remaining nineteen have jahr. Compare the hams letter س with ز: their places are close, but airflow and sound quality differ.
Importantly, ص is one of the hams letters and also has higher-tongue and iṭbāq qualities. Thus hams does not automatically mean a thin or feeble consonant. A letter possesses several qualities simultaneously.