Jiang et al. (1) address the fundamental question of the origin of submicron primary sea salt aerosols by proposing the mechanism of film flapping in bubble bursting. To support that, they report detailed experimental measurements of aerosols produced by controlled-size bubble swarms. First, instead of the equivalent bubble volume radius R, Jiang et al. use the bubble cap radius (approximately twice R, for most of the relevant size range) calculated according to Toba (2). However, comparing the average number of particles produced per bubble, Jiang et al. mix their data with other works that use the equivalent radius R (ref. 1, figure 3B). The correct comparison is shown here in Fig. 1 using the Laplace number La = ρσR/μ2 (ρ,σ, and μ are the liquid density, surface tension, and viscosity).
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