Overall, how do the notes made from the three bottles compare with one another? Why do you think that is?.How does the note this bottle makes compare with the one made by the half-full bottle? Is it higher or lower in pitch than the half-full bottle? It may take some practice to make a note from this bottle. Then blow across the top of the bottle that is three quarters full.How does the note that the half-full bottle makes compare with that made by the empty bottle? Is the note from the half-full bottle higher or lower in pitch? Then blow across the top of the half-full bottle. Blow across the top of the empty bottle, as you did before.Fill this bottle with water up to the mark you just made. On another bottle make a small mark at exactly three quarters up.Fill this bottle with water up to the mark you made. Using the permanent marker and ruler, make a small mark at exactly halfway up the bottle. Measure the height of one of the bottles.How does the bottle sound? If you cannot make a note by blowing over the bottles, try using different bottles for this activity. When you get the angle and airflow just right, you will hear a musical note as the air column in the open bottle resonates. Touch your lower lip to the edge of the bottle, pursing your upper lip and blowing gently over the opening. Do this by holding the bottle upright (so it is perpendicular to your face).

Try blowing across the tops of the bottles you selected to make a resonant sound.Make sure the bottles are clean and empty.Three identical narrow-neck bottles (They can be glass or plastic.).The pitch of the sound we hear depends on the frequency of the wave-how quickly an increase in air pressure is followed by a decrease. Specifically, these vibrations cause patterns of air compression that travel as a wave, with air pressure increases being followed by decreases. How do musical instruments make the sounds that they do? All sound is made by vibrations that travel through the air. These bottles will function as closed-end air columns, which are basically tubes that are open at one end but closed (or covered) at the other. In this activity you'll try a simple example of the latter type of instrument: narrow-necked bottles that are partially filled with water. Some musical instruments produce sound from vibrating strings, others from vibrating reeds and still others from resonating columns of air. In this science activity you will use bottles to investigate how the length of a closed-end air column affects the pitch of the note that it makes. Have you ever blown across a bottle's top and made a pleasant, resonant sound? If so, have you wondered exactly how that note is made? A bottle is actually what is called a 'closed-end air column.' Clarinets and some organ pipes are examples of musical instruments that work in the same way.

Liquid music vs liquid notes