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Message: <blockquote data-quote="jbtsax" data-source="post: 235813" data-attributes="member: 1801"><p>Good point.  I don't yet know the physics of this, but I do know that the larger the surface area the air "pushes" against, the more force is applied.  Try holding up a 4'x8' piece of plywood in a moderate wind to really understand this principle.  It shouldn't be that difficult to set up an experiment to see what air pressure it takes to force open a clarinet low Ab or Gb key.  It is probably less than the pressure needed to open a C#/G# or a side key due to their smaller pad surface.</p></blockquote><p></p>