Strange air flow problem

  • Thread starter swerider
  • Start date
  • #1
7
0
if you use your mouth to blow air through a pipe (an A4 page rolled into a pipe for simplicity) with your mouth against the pipe, the outlet flow is much less compared to when you blow through the pipe with your mouth away from it. In terms of fluid mechanics, why does this happen?
 

Answers and Replies

  • #2
minger
Science Advisor
1,495
2
Because if you have you lips against the paper, then the only air that can come out of the paper. Basically, in order for air to go out, air must come in. If your lips are against the paper, you're stopping air from coming in.
 

Related Threads on Strange air flow problem

  • Last Post
Replies
6
Views
3K
  • Last Post
Replies
0
Views
2K
Replies
4
Views
14K
  • Last Post
Replies
3
Views
2K
Replies
12
Views
2K
Replies
7
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
14K
Replies
12
Views
4K
Replies
1
Views
2K
Top