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Originally Posted by Sam Kapasi The port is a hollow tube ya, the volume will be super negligible. The old man is too much  |
the port is a hollow tube but the air mass in the tube is a Helmholtz resonator. A Helmholtz resonator is nothing more than an enclosed volume of air connected to the outside world by a narrow tube, called the port. but for volume calculations it is better approximated as a solid rod and not a hollow tube.
This book explains it in better and greater detail.
http://en.wikibooks.org/wiki/Enginee...closure_Design