This number is incredibly useful in directly determining how well a wood will withstand dents, dings, and wear—as well as indirectly predicting the difficulty in nailing, screwing, sanding, or sawing a given wood species.| The Wood Database
This is a measure of a wood’s weight in relation to a preset volume. Usually it’s pounds per cubic foot (lbs/ft3), or in metric units: kilograms per cubic meter (kg/m3). However, a wood’s weight will also greatly depend on it’s moisture content (MC). For instance, a board that has just been freshly cut (called “green” wood) can weight more than double its oven-dry weight! Since there are so many sources of information on wood properties, and not all of them use the same standards...| The Wood Database