Bottle Tops 12-8-14 (due date) 12-7-14 (finished) Addison Plantz My project is about finding what size bottle makes a lower pitch sound when blown into with the same amount of air for each bottle.

Scientific Question: When I blow, which bottle with have the lowest pitch sound? I predict that the smallest bottle will have the lowest sound. I think this because when you blow into a smaller bottle, there is less area for the sound(s) to be deeper.

Background: The reason that I chose this experiment is because it had to do with music. When it comes to music and singing, your voice and other people’s voices have different pitches and tones. Not only is it voices that have pitches and tones. Musical Instruments do too! My experiment also proves that not everything that deals with pitch and tone has to do with human voices or instruments, but bottles too.

Hypothesis: If I blow into the smallest bottle that I’m using in my procedure, then the smallest bottle will have the lowest sound(s).

Variables: Independent variable: Plastic bottles used in the procedure Dependant variable: Sounds made by air in bottles Control variables: (3) Placement of where the experiment is being performed Amount of air being blown into bottles Distance from mouth to the edge of the bottle

Procedure: First: I gathered all the materials I would need to perform my experiment. Second: I made sure that all the fans and other items in the room that could increase the pitch of the sounds were off. Third: I placed the smallest bottle that was labeled “bottle 1” on the table. I blew into bottle one after it was placed and recorded the depth of the pitch. I’ll need to do that each time for each experiment. Fourth: I placed the medium size bottle (#2) in the same place as bottle number one was placed while being performed. After the bottle was placed, I then blew into that one and recorded the depth of the pitch. I needed to be careful so that I only blew the same amount of air for each time the experiment was performed. Fifth: Last but not least, I placed the largest bottle (#3). I once again made sure that the bottle was in the same place. Finally i blew into the bottle and recorded the pitch depth.

Data: For my project, I was not able to make a graph for the pitch of the sounds. Only because i wasn’t able to measure the highness and the lowness of the sounds. The data that I did collect, was written down on paper and I’m now typing below: Bottle 1 (smallest): Higher pitch sound Bottle 2 (medium): Low/high pitch sound (medium, kinda high) Bottle 3 (large): Deep pitch sound (lower than other bottles)

Conclusion: In conclusion, my hypothesis was incorrect. The large bottle (#3) had the lowest pitch. I now know that the larger bottles have the lower pitch because there is more space for the air molecules to bounce off of each other and make lower pitch sounds while they’re inside of the bottle.