Table 1.
Values of density and velocity for air (co, ρo), bricks (cb, ρb) and gypsum board (cg, ρg).
| ρo (kg/m3) | 1.21 |
| ρb (kg/m3) | 1,800 |
| ρg (kg/m3) | 650 |
| co (m/s) | 340 |
| cb (m/s) | 3,800 |
| cg (m/s) | 6,790 |
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