Mathematics is part of our daily life, even though we don’t use all of its aspects. That is something that we hear all the time while we are at school, but **not all people have the luck of understanding math.**

There are some basic things that every adult knows about math, one of them is the existence of different specific numbers that have their own symbol, like **the Pi number**, which **is part of many maths and physics equations.** We know its character and we may know some of the sequences of the numbers that it stands for, but usually, we don’t know how it works.

To start, we have to understand that Pi is one of the most important constants in science, it is defined as the relationship that exists between the diameter of a circumference and its length. Basically, this value **will always be the same,** no matter what circle we are talking about.

This number has been studied since ancient times, and its proximate decimals have changed along the way. Every day more decimals appear since it is an infinite number and** no one could ever be able to know the whole exact value.**

**So, What’s Pi?**

Pi is an irrational number, which means that it can’t be expressed in whole numbers, **like 2 or 4,** so it will always be a fraction or a decimal. Similarly, this constant would never be the root of any whole number, and this fact created a lot of shock in the science community because this proved that the ancient squaring the circle geometric problem is impossible to solve.

Now, even though it is like a mystery, it still is used from the most basic trigonometric equations to the ones that are used to study the origin of the Universe. First, it has an important role in geometry, and most figures and shapes can be studied based on Pi. Also, it is often used in quantum mechanics because it has a direct relationship** to the waves of light and their location.**

There are many fun facts about the Pi number, like that if you use the first forty decimals you can know the almost exact value of the Milky Way’s curvature, that it has more than **2.5 billion decimals,** or that March 14th is the official day of Pi.

Of course, there are more uses and definitions of Pi, but we are going to keep the basic knowledge** and let the difficult part for scientists to understand.**