Table 2. Effectiveness of different surgical masks for cough droplets of size 620 μm.
Here, critical regime denotes droplets with diameter less than 100 μm.
| Mask type | Initial volume, vi (nl) |
Penetrated volume percentage (vp/vi) |
Percentage volume in critical regime (vc/vi) |
Number counts of penetrated droplets |
|
| Mask A | Single layer | 123.4 | 69.88% | 8.43% | 100–132 |
| Double layer | 123.4 | 8.21% | 2.28% | 15–42 | |
| Triple layer | 123.4 | 0.22% | 0.22% | 0–1 | |
| Mask B | Single layer | 123.4 | 64.3% | 13.07% | 91–109 |
| Double layer | 123.4 | 3.7% | 1.87% | 11–16 | |
| Triple layer | 123.4 | 0% | 0% | 0 |