Real-life applications of Density and Relative density

The concepts of density and relative density are widely used in real life. They help us in making informed decisions in science, engineering, industry, and daily activities. Below are some common applications:

1. Identification of gemstones Relative density helps in identifying precious stones such as gold and diamond. These materials have unique density values that help distinguish them from fake or imitation stones.
2. Geological and mineral analysis Geologists and mineralogists use density to determine the composition of rocks and soil samples. It helps in discovering the type of minerals present in a particular area.
3. Selection of building materials In construction, density is considered when choosing materials. Materials with high density are used for strong foundations, while low-density materials are used where light weight is preferred, like ceiling boards or roofing panels.
4. Design of swimming and diving equipment Manufacturers consider density when designing items such as life jackets, swimming tubes, and diving suits. These items must be less dense than water to allow a person to float or swim easily.
5. Design of marine and air vessels Engineers use the concept of density to design ships, submarines, and aeroplanes so that they can float or fly.
   • For marine vessels like ships: although made of heavy metal, ships are designed with hollow structures that contain air, reducing their overall density so they can float on water.
   • For aircrafts: aeroplanes are made from aluminium alloys instead of steel. This is because:

     • Aluminium has a lower density, making the plane lighter and more efficient.

     • Aluminium is resistant to corrosion, which increases the safety and lifespan of the aircraft.

       

       An aeroplane

6. Determining the density of unknown substances Relative density can be used to find the density of an unknown material by comparing it with a substance of known density. This is commonly done in laboratories using tools like the relative density bottle.