Class 9 Exam > Class 9 Notes > Relative Density - Sound, Class 9, Science
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RELATIVE DENSITY
Relative density (R.D.) of a substance is the ratio of the density of the substance to the density of water at 4°C.
Thus, Relative density =
Unit of Relative Densit
Since relative density is a ratio of two similar quantities, it has no unit.
Further, relative density =
= 
If the volume of a given substance is equal to the volume of water at 4°C,
relative density = 
Relative density can also be defined as the ratio between the mass of the substance and the mass of an equal volume of water at 4°C.
PRESSURE IN FLUIDS
A substance which can flow is called a fluid. All liquids and gases are thus fluids. We know that a solid exerts pressure on a surface due to its weight. Similarly, a fluid exerts pressure on the container in which it is contained due to its weight. However, unlike a solid, a fluid exerts pressure in all directions.
A fluid contained in a vessel exerts pressure at all points of the vessel and in all directions.
All the streams of water reach almost the same distance in the air.
PASCAL'S LAW
In an enclosed fluid, if pressure is changed in any part of the fluid, then this change of pressure is transmitted undiminished to all the other parts of the fluid.
FAQs on Relative Density - Sound, Class 9, Science
| 1. What is relative density? |  |
Ans. Relative density is a measure of how dense one substance is compared to another substance. It is the ratio of the density of a substance to the density of a reference substance, usually water.
| 2. How is relative density different from absolute density? | |
Ans. Relative density compares the density of a substance to the density of a reference substance, while absolute density is the measure of how much mass is present in a given volume of a substance. Relative density is a dimensionless quantity, whereas absolute density has units such as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).
| 3. What is the significance of relative density in sound? | |
Ans. Relative density plays an important role in determining the speed of sound in different media. It affects the compressibility and elasticity of a substance, which in turn affects the speed at which sound waves can travel through it. For example, sound travels faster in solids with higher relative densities compared to liquids or gases.
| 4. How can relative density be determined experimentally? | |
Ans. Relative density can be determined experimentally by using a hydrometer or a specific gravity bottle. A hydrometer measures the density of a liquid by floating in it, while a specific gravity bottle measures the density of a solid or liquid by comparing its mass to the mass of an equal volume of water.
| 5. Can relative density be used to identify substances? | |
Ans. Yes, relative density can be used as a characteristic property to identify substances. Each substance has a unique relative density, which can be compared to known values to determine its identity. This property is particularly useful in fields such as geology and material science, where identifying minerals or materials based on their relative density is common practice.
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