The loudness of a sneeze is primarily determined by the depth of the inhale preceding it. A larger, deeper inhale results in a more forceful expulsion of air, leading to a louder sneeze.
The Mechanics of a Loud Sneeze
Several factors contribute to the variation in sneeze volume:
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Inhale Size: As noted by multiple sources (WGN-TV, Yahoo), the initial inhalation plays a crucial role. A larger inhale provides more air for the forceful expulsion during the sneeze.
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Lung Capacity: Individuals with larger lung capacities naturally have more air available to expel, contributing to louder sneezes (Quora).
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Respiratory System Structure: The structure of the respiratory system, including the size and shape of the nasal passages and airways, influences the flow and pressure of air during a sneeze (Popular Science).
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Vocal Cord Vibration: The expelled air passes over the vocal cords, causing them to vibrate (Reddit). This vibration intensifies the sound, contributing to the perceived loudness. It's important to note that this is an involuntary process; people cannot consciously control this aspect of the sneeze.
While some might perceive exceptionally loud sneezes as intentional, they are purely physiological responses. There's no evidence to suggest people consciously control the loudness of their sneezes (ABC News).
Why is there variation?
The variation in sneeze volume stems from the natural differences in the individual's respiratory system and physiology. Factors like body size and muscle strength can also play a minor role (Lifehacker).
