Figure 3
From: Spatiotemporal droplet dispersion measurements demonstrate face masks reduce risks from singing
Boxplot with individual data points for mean velocity magnitude (MVM) across different vocal tasks. PTV accuracy is dependent on a higher number (100 s) of images containing significant number of particles. For PIV the concentration of droplets must be higher for valid measurements to be attained. Several participants, for some tasks did not produce droplets to a level that satisfies the above conditions, as such no meaningful measurements could be taken. Data are not available for saying ‘snake’ with a mask, singing a note with a mask and singing ‘Happy Birthday’. Figures produced in R software 4.0.434 using the ggplot2 package35.
