Figure 7 | Scientific Reports

Figure 7

From: Speech air flow with and without face masks

Figure 7

Audio and Schlieren of speech through a KN 94 mask with a slight leak (Frame 439, 1st block, Onnuriplan KN 94). The air flow comes out in front and above the eyes and below the chin. The air flow moves slowly forward and upwards. The red-dashed line in the audio waveform indicates the timing of the schlieren frame.

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