Bottle. sound by blowing across the top

  • Context: High School 
  • Thread starter Thread starter Goodver
  • Start date Start date
  • Tags Tags
    Sound
Click For Summary

Discussion Overview

The discussion revolves around the phenomenon of sound production when blowing across the top of a bottle, contrasting it with blowing inside the bottle. Participants explore the mechanics of sound generation, resonance, and the role of airflow dynamics in this context.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant states that sound is produced by standing waves created in the air inside the bottle when blowing across the top.
  • Another participant claims that blowing inside the bottle does produce sound, but suggests it may not resonate at the correct frequency.
  • A question is raised about the difference in resonance when blowing across the top versus inside the bottle.
  • One participant proposes that turbulence in the airflow when blowing across the edge of the bottle contributes to sound production.
  • Another participant elaborates that the edge of the bottle creates a vortex pattern that leads to periodic pressure disturbances, which propagate as sound waves.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of blowing inside the bottle for sound production, with some asserting it does produce sound while others question its resonance capability. The discussion remains unresolved regarding the mechanics of sound generation in both scenarios.

Contextual Notes

There are assumptions about airflow dynamics and resonance that are not fully explored, and the discussion does not clarify the specific conditions under which sound is produced in each case.

Who May Find This Useful

This discussion may be of interest to those studying acoustics, fluid dynamics, or sound production mechanisms in musical instruments.

Goodver
Messages
101
Reaction score
1
sound created by blowing across the top of the bottle produces sound due to standing waves created on air inside the bottle.

why blowing inside the bottle does not produce sound but only across?

how vibrations created on air inside the bottle propagate in space as they are separated from outside by the walls of bottle? or the walls of bottle start to vibrate?

thank you
 
Physics news on Phys.org
Goodver said:
sound created
why blowing inside the bottle does not produce sound
It does, but wrong with frequency to resonate.

Goodver said:
how vibrations created on air inside the bottle propagate in space as they are separated from outside by the walls of bottle?
The bottle is open, isn't it?
 
  • Like
Likes   Reactions: 1 person
thanks A.T.

why blowing across the top produces resonance while blowing in not?
 
Goodver said:
thanks A.T.

why blowing across the top produces resonance while blowing in not?

I believe this is to do with turbulence. The air flow is probably more turbulent when you blow across the edge of the bottle.
 
CWatters said:
I believe this is to do with turbulence. The air flow is probably more turbulent when you blow across the edge of the bottle.

Yes. When the edge splits the air flow, it separates and creates a periodically repeating vortex pattern similar to the one seen below. The periodic pressure disturbances propagate as sound waves that can resonate.

https://www.youtube.com/watch?v=bVNvH51CmlE
 
  • Like
Likes   Reactions: 1 person

Similar threads

  • · Replies 29 ·
Replies
29
Views
5K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 14 ·
Replies
14
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 49 ·
2
Replies
49
Views
5K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 31 ·
2
Replies
31
Views
5K
  • · Replies 2 ·
Replies
2
Views
2K