Because any amount of wood weighs less than the same amount of water does.
Which is just an easier way of saying that the density of almost all varieties of wood
is less than the density of water.
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A block of wood floats in water because wood is less dense than water. The upward buoyant force exerted by the water is greater than the downward force of gravity acting on the wood, allowing it to float.
If a block of wood floats in water, it means that the density of the wood is less than the density of water. This is because objects with a lower density than water will float, while objects with a higher density will sink.
Whether a piece of wood floats or sinks in water depends on the density of the wood. If the wood has a lower density than water, it will float. If it is denser than water, it will sink. Wood is usually less dense than water, so it typically floats.
A block of wood floats higher in saltwater because saltwater is denser than fresh water, providing more buoyant force. The increased density of saltwater displaces more water, pushing the block of wood higher above the surface compared to fresh water.
Wood mostly floats in water because it has a lower density than water. it is NOT lighter than water, it is LESS DENSE. water has a density of 1.0 g/cm cubed. that means wood usually has a density of .99 or less. But, not all wood floats, keep that in mind
If a block of the substance floats in water, it means that the density of the substance is less than the density of water. Since objects with lower density than water float in water, we can infer that the substance is less dense than water.