1 gram per cubic centimeter
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The density of anything is the ratio of the weight (really the mass) to the volume that the material occupies. Water was involved in the original definition of units of mass and volume, so it has a rather special value of density. To a good approximation, the density of water is 1 gram per milliliter.
It's actually pretty easy. If the density of the substance is higher than the density of water, the object will sink. If the density of the substance is lower than the density of water, the object will float. Be aware though that various substances may have dissolved into the water, thus changing its density. For example, seawater has a different density than fresh water.
yes water can increase the density of water as wood has the power to absorb water and so the density of water is drastically increased
this is valid for water only (or any fluid with same density as water) water density (@0°C) = 1000 kg/m^3 (actual value is 999.8395 kg/m^3) = 1 g/ml volume = mass / density = (20 g) / (1 g/ml) = 20 ml
Pure water has a density of 1,000 kg/m3