1. Airflow: In singing, the air flows through the vocal cords, causing them to vibrate and produce sound. In whistling, the air flows over the lips, causing them to vibrate and produce sound.
2. Pitch: The pitch of a sung note is determined by the frequency of the vibrations of the vocal cords. The pitch of a whistled note is determined by the frequency of the vibrations of the lips.
3. Volume: The volume of a sung note is determined by the amount of air that is expelled from the lungs and the force with which the vocal cords vibrate. The volume of a whistled note is determined by the amount of air that is expelled from the lungs and the force with which the lips vibrate.
4. Tone: The tone of a sung note is determined by the shape of the vocal tract and the resonances of the sinuses. The tone of a whistled note is determined by the shape of the mouth and the resonances of the oral cavity.
5. Articulation: In singing, the vocal cords can be used to produce different sounds, such as vowels and consonants. In whistling, the lips can be used to produce different sounds, such as pitches and trills.
Despite these differences, singing and whistling are both methods of producing sound by expelling air from the lungs and vibrating the vocal cords or lips.