# what is the difference between density and relative density of a substance

DENSITY: the density of the object is defined as a mass of a unit volume.

RELATIVE DENSITY:It is the ratio of the density of the object to the density of the water.

RELATIVE DENSITY=DENSITY OF THE OBJECT/DENSITY OF WATER

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When you are talking about the mass by unit volume, it is called as density.

For eg. Density of water = 1000 kg m-3

Density of any other substance = x

Depending upon what the value of 'x' is, the other substance may sink / float.

But when you are 'comparing' the density of value of object x to the density of water, it is reffered to as relative density.

For eg. Density of any substance = 1000 kg m-3
But, if    Density of water  = 1 kg m-3,

Then acc. to the formula,
Relative Density = DENSITY OF THE OBJECT/DENSITY OF WATER

= 1000/1  = 1000

Since it is more than the 1, obviously it will sink.

This is the concept.

Hope it helps.
Cheers!

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Density is defined as mass per volume. Density of a material is the amount of substance contained in unit volume of the material. SI unit of density is kg/m3.

Relative density is the ratio of density of a substance to the density of a reference material. Usually, the reference material is water. Relative density is also known as specific gravity.

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Density:

The density of a substance is defined as mass of the substance per unit volume i.e

Density = Mass / Volume .

The SI unit of density is kg/m3

Relative Density:

The Relative Density of a substance is the ratio of its density to that of water. i.e

Relative Density = Density of substance / Density of water.

Relative Density is unitless.

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The density of a substance is defined as the mass per unit volume of that substance. The SI unit of density is kg/m3.

The relative density of a substance is the ratio of its density to that of a reference material. Usually, the reference material is water. Relative density is also known as specific gravity. It is a pure number, and has no unit

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