A sneeze is a spasmodic involuntary action and violent expiratory event. This event results in the ejection of air from the lungs through both the nose and mouth, driven primarily by foreign substances irritating the nasal mucosa that cause the respiratory fluids to break up into drops or aerosols in a fraction of a second.1–3 Demonstrating the natural sneeze with a human is a complex exercise. Therefore, two independent mock-up experiments are proposed to visualize the breakup morphology of a sneeze, as shown in Fig. 1.
First is the explosion of a latex balloon inside water by pumping air into it until it pops. Second is the explosion of a soap bubble on a flat plate. The former depicts the thin sheet expansion and breakup process. In contrast, the latter illustrates the different intermediate processes that govern the formation of droplets or aerosols from the thin respiratory liquid...
