Relative Theory
The relative density of a substance is ratio of its density to the density of water, ie Relative density of matter = density of matter / density of water 4`C
The relative is the ratio of two equal quantities ( masses ), there is no unit. Hence the relative density is just a number.When ice is placed in water, 1/10 of it remains outside the water due to relative density.
Theory of Floats
When an object is immersed in a liquid, the weight of the object is equal to the fluid displaced by its submerged part.
When W > F means the weight of the object is greater then its uptake or buoyancy force, in this state the object will sink in to the fluid.When W = F means the weight of the object is equal to the weight of the fluid is has removed, then the resulting force on the object is W - F = 0 In this case the object floats jest below the surface of the liquid.
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