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What is the relative density of wood?
Density: The density of a substance is defined as the mass per unit volume of the substance.
Relative density: Relative density of a substance is the ratio of its density to that of water.
Wood is mostly made of dead cells, which are composed of cell walls and cell cavities. The density of the material that constitutes the cell walls is about 1.5 g.cm-3 for temperate woods.
The relative density of wood:
The relative density of wood is the ratio of its density to that of water. It is a dimensionless quantity. It is a ratio and has no units.
To find the Relative density of wood, we can take a uniform area block of wood and make it float on water and find the volume of the block inside water.
The relative density of wood = $\frac{\text{Total volume of block}}{\text{Volume of block inside the water}}$
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