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View full-text article in PMC

. 2021 Aug 31;118(37):e2105279118. doi: 10.1073/pnas.2105279118

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Fig. 2. — Snapshots of the sneezing event at $t = 0.25 s$ (A and C) and $t = 0.50 s$ (B and D), where $t = 0$ represents the beginning of the respiratory event. A and B refer to $T = 5 ° C$ and $R H = 90 %$ , while C and D refer to $T = 20 ° C$ and $R H = 50 %$ . The background shows the local value of the relative humidity (white, low; black, high). The respiratory droplets are displayed rescaled according to their size (not in real scale) and are also colored according to their size (red, small; white, large). We can appreciate how most droplets move together with the turbulent gas cloud generated by the sneezing jet. This cloud is characterized by a much larger value of RH with respect to the ambient. In addition, for $T = 5 ° C$ and $R H = 90 %$ (A and B), a wide region is characterized by supersaturated conditions ( $R H > 100 %$ ).