Different woods have different densities, grains, and mechanical properties. 1 cubic cm in volume is used to measure density. Since the mass of 1 cc of water is 1 g at sea level, any wood with a density higher than 1 will sink, while any wood with a density below 1 will float. XRT X is the cross-section of the wood. It shows rings, rays, and cells.
R is a radial view of the wood.
It shows the rings in side view. They appear as vertical streaks. Radially cut or quarter-sawn wood is expensive because only a few pieces can be obtained from each log. T refers to a tangential cut. It shows the ends of the rays.