When a piece of wood floats on the water surface, it is measured that 1 / 5 of the volume of the wood is above the water surface, from which the density of the wood can be calculated______ Kg/m3．

When a piece of wood floats on the water surface, it is measured that 1 / 5 of the volume of the wood is above the water surface, from which the density of the wood can be calculated______ Kg/m3．

Let v be the volume of the block, ∵ the block floats, ∵ the mass of the block is equal to the mass of the water it displaces, then we can get: ρ wood v = ρ water 45V, then we can get that ρ wood = 0.8 × 103kg / m3. So the answer is: 0.8 × 103kg / m3

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