Summer Tests the Bypass Plugs
One of our colleagues in the UK has suggested that we should try our blowing pressure tests with a small hole that allows some air to escape. This allows the experimenter to check how her maximum blowing pressure might change as her lungs transition from full to empty. It is also expected to minimize the duration over which her cheeks can maintain a higher pressure than her lungs. So in this particular experiment, we have prepared five brass plugs with holes drilled in them as follows: brown - #15 drill - 0.1800" dia - 0.02545 sq in area red - 1/8" drill - 0.1250" dia - 0.01227 sq in area orange - #43 drill - 0.0890" dia - 0.006221 sq in area yellow - 1/16" drill - 0.06250" dia - 0.003068 sq in area green - #57 drill - 0.04300" dia - 0.001452 sq in area As you can see, each successive plug has half the open area of the last. For each plug, Summer takes a full breath, fully inflates her cheeks, and pushes all her air through the hole as fast as she can.
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