# What is density?

Just like any other unit of measurement, density has a variety of uses and applications in various fields. It has been used by scientists to solve problems, especially geological ones.

What is density?

Density is a unit used to measure the compactness of a substance and is mainly calculated in kilograms per cubic meter (Kg / m3) or grams per cubic centimeter (g / cm3). Therefore, the density of each object can be on average equated with the sum of its mass divided by the aggregate volume of the object. In simple terms, density is the number of kilograms that a cubic object of a meter weighs.

Each substance has its own density because each is composed of different molecules and atoms. Therefore, it is not the mass of an object that determines the density but the mass. For example, metal, wood and plastic of the same size have different densities because they have different masses. They have different masses because each one differs in the way atoms are packaged to form the object. For example, metals such as copper, iron and lead have more tightly packed atoms than plastic and wood, so the higher masses of these metals are what make them denser than wood and plastic.

It is also important to consider the fact that mass is not a weight and that mass remains constant despite the changes taking place. However, the weight changes. For example, an individual’s body weight on Earth will change if the individual moves to the Moon.

How to calculate the density

To make understanding easier, we will see an example of how to calculate the density of a substance. First, it may be necessary to remember that density is the volume that divides by the mass of the same object. We will start by observing a cubed object with each side that measures the 4 meters with a mass of 5 kilograms.

Now that we need both the volume and the mass, we will first calculate the volume for which we will multiply the length (L), the width (W) and the height (H); hence, Volume (V) = 4m * 4m * 4m, providing us with 64 cubic meters. And since the mass is 5 kilograms, so density = volume divides by mass., That is 64 cubic meters divided by kilograms 5. Therefore, the density of the object indicated above is 12.8kg / m3.

Application of density

The application of density is wide. Ranging from shipbuilding to rock identification. To get an in-depth understanding, let’s briefly discuss how it is applied to floating objects in water.Density is also used for the identification of minerals and understanding of the rock composition. It also monitors ocean currents and circulation.