Re: Any Physicists here?? :-S
instead of humidity, pressure is a better word.
cant really say whether i m right or wrong, but might be size or wood, and gauge as well needed to be controlled. 
may be type of wood as well 
Re: Any Physicists here?? :-S
instead of humidity, pressure is a better word.
cant really say whether i m right or wrong, but might be size or wood, and gauge as well needed to be controlled.
may be type of wood as well