Fig. 2.

Mean velocity field produced when speaking three different sentences. A color code illustrates the average speeds but note that single images of the magnitude of speeds are not representative of the true instantaneous velocities, which were estimated from Movies S1–S5. (A) “We will beat the corona virus,” which is a mixture of vowels, fricatives and plosives. (B) “Sing a song of six pence” (SSSP) (25), mainly composed of the fricative “S” except the last word that starts with “P.” (C) The distance traveled by the extremity of the air puff as a function of time when saying “pence” at the end of SSSP for three different runs. (D) “Peter Piper picked a peck” (PPPP) (25), which is mainly composed of many plosives P.