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A?Helmholtz resonator oscillator is a container of gas (usually air) with an open hole (or neck or port). A volume of air in and near the open hole vibrates because of the 'springiness' of the air inside. The term Helmholtz resonator is now more generally applied to include bottles from which sound is generated by blowing air across the mouth of the bottle. In this case, the length and diameter of the bottleneck also contribute to the resonance frequency and its Q factor. By one definition a Helmholtz resonator augments the amplitude of the vibratory motion of the enclosed air in a chamber by taking energy from sound waves passing in the surrounding air. In the other definition, the sound waves are generated by a uniform stream of air flowing across the open top of an enclosed volume of air.
