here is a table of wood densities compiled from several sources.
Solid Density (103 kg/m3) (lb/ft3)*)
Balsa 0.09 6 6
Balsa 0.16 10 10
Balsa 0.22 14 14
Paulownia 0.29 18 18
Balsa 0.3 19 19
Bamboo 0.3 - 0.4 19 - 25 19
Basswood 0.3 - 0.6 20 - 37 20
Pine, white 0.35 - 0.5 22 - 31 22
Poplar...