When you're walking outside the top of your shadow is blurry. This is because of diffraction!
how is petrol used in our everday life
It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
Tools that are commonly used to study daily life include things like polls and surveys. Sometimes video cameras and audio recordings are also used to study daily life.
I use the Golden Ratio in my daily life to design websites.
These nuts
You pet them
Sunblock.
in alternators
In dentistry .
They are used in airplanes and in sailboats.
zero is used badly
decimals are a part of our daily life because they are used to separate dollars from cents.