voiceless labiodental fricative

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A schematic mid-sagittal section of an articulation of a voiceless labiodental fricative

labiodental fricative voiceless oral pulmonic consonant

place lower lip on upper front teeth
bring two articulators together so that the airstream is partially obstructed and turbulent airflow is produced
do not vibrate the vocal cord
air is allowed to escape through the mouth only
push air solely with the lungs and diaphragm