# Quick Answer: What Is Relative Density In Science?

## What is relative density and density?

Density is by definition the ratio of the mass and volume of a body. Relative density is the ratio between the density of a measuring substance and the density of some other reference substance at a given temperature (typically water).

## What are the examples of relative density?

Examples

• The relative density of pure water at 4 C is 1.
• The relative density of balsa wood is 0.2. Balsa is lighter than water and floats on it.
• The relative density of iron is 7.87. Iron is heavier than water and sinks.

## What is relative density Byjus?

What is Relative Density? The specific gravity of a substance will let us know if it will float or sink, it gives us the idea about relative mass or relative density. If the specific gravity of a substance is below 1 then it will float and if it is greater than 1 it will sink.

## What is relative density and its unit?

Relative density is the ratio of density of a substance to the density of water at 4 C.Since the units for both the numerator and denominator are same, they cancel each other. Thus relative density has no units. Density is defined as mass per unit volume. Hence its SI unit is: kg/m3.

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## What is relative density in simple words?

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. For example, an ice cube, with a relative density of about 0.91, will float. A substance with a relative density greater than 1 will sink.

## What is relative density of gas?

The relative density ρr is the ratio of the mass of a unit volume of the gas to that of the same volume of a reference gas, usually air or nitrogen. As this is a ratio, it is dimensionless.

## What is relative density in science for kids?

Relative density is a ratio of the densities of two materials. The term specific gravity is similar but not same. In specific gravity, the reference material is water. If a substance’s relative density is less than one then it is less dense than the reference; if greater than 1 then it is denser than the reference.

## What is SI unit of density?

Density is defined as mass per unit volume. It has the SI unit kg m3 or kg/m3 and is an absolute quantity. It is therefore a relative quantity with no units.

## Why relative density has no unit?

Final answer is (B), the relative density does not have a unit because it is a ratio of two-dimensionally same quantities. Note: When we divide two-dimensionally the same quantity they get cancelled and their ratio is dimensionless. The relative density concept is highly used in the pressure measurement of the fluids.

## What is the relative density of an object?

Relative density is equal to the ratio of the density of the object in air to the density of the water in which it is immersed. Note: When the relative density of an object is equal to 1 then the densities of both the materials are equal.