Pandemic science, Talk quietly please
September 10, 2020
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Dr John Campbell Episodes Around September 10, 2020
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13:13Now PlayingPandemic science, Talk quietly please
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as posted by the channelAerosol emission and superemission during human speech increase with voice loudness (Nature Scientific Reports)
Coughing and sneezing, visible droplets + small ones
Visible, 50 micrometres upwards
Normal speech, just the small ones
One micrometre, invisible
Carry a variety of communicable respiratory pathogens
Particle emission during normal human speech, positively correlated with the loudness (amplitude)
Quite, low amplitude = 1 to 50 particles per second
Loud, high amplitude = 10 to 500 particles per second
Regardless of the language spoken (English, Spanish, Mandarin, or Arabic)
Counting aloud from 1 to 100 releases at least 6 times as many particles as an individual cough
Singing, x 6 compared to normal speech
Speech superemitters
x 10
Small particles
Suspend in the air
Penetrate deeper
Applications
Normal speech 10 decibel range
Ambient noise in restaurants, 70 decibels
Quite zones in public spaces
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