Table 5.
Estimated droplet number concentrations during coughing and speaking using the measured size profile at 10 mm
| Size class (μm) | Speaking (L−1) |
Coughing (L−1) |
||||||
|---|---|---|---|---|---|---|---|---|
| D | L&R | Z | L.V. | D | L&R | Z | L.V. | |
| 3 | 0.11 | 6.36 | 4.59 | 168 | 189 | 99 | 86 | |
| 6 | 1.65 | 98.74 | 66.21 | 2311 | 2604 | 1355 | 1187 | |
| 12 | 0.56 | 33.81 | 22.23 | 857 | 966 | 501 | 444 | |
| 20 | 0.30 | 17.74 | 11.33 | 281 | 317 | 165 | 144 | |
| 28 | 0.20 | 11.71 | 7.87 | 105 | 118 | 62 | 54 | |
| 36 | 0.10 | 6.02 | 4.32 | 101 | 114 | 59 | 50 | |
| 45 | 0.11 | 6.36 | 4.47 | 84 | 95 | 49 | 41 | |
| 62.5 | 0.11 | 6.69 | 4.57 | 84 | 95 | 49 | 43 | |
| 87.5 | 0.08 | 4.69 | 3.44 | 59 | 66 | 35 | 30 | |
| 112.5 | 0.11 | 6.36 | N.A. | 4.52 | 71 | 80 | 42 | 36 |
| 137.5 | 0.10 | 6.02 | 4.31 | 67 | 76 | 39 | 34 | |
| 175 | 0.11 | 6.36 | 4.52 | 185 | 208 | 108 | 93 | |
| 225 | 0.09 | 5.36 | 3.85 | 105 | 118 | 62 | 53 | |
| 375 | 0.08 | 5.02 | 3.45 | 88 | 99 | 52 | 44 | |
| 750 | 0.03 | 2.01 | 1.11 | 59 | 66 | 35 | 30 | |
| 1500 | 0.00 | 0.00 | 0.00 | 0 | 0 | 0 | 0 | |
| Total (in cm−3) | 3.72 (0.004) | 223.25 (0.223) | 150.80 (0.151) | 5212 (5.212) | 2713 (2.713) | 4625 (4.625) | 2368 (2.368) | |
Key: D—refers to Duguid (1946); L&R— refers to Loudon and Roberts (1967); Z—refers to Zhu et al. (2006); and L.V.—estimation using laser measurement volume.