So as you know rain has a distinct smell much like a pleasent and relaxing one so today we are gonna learn and know all about it.

So let's start

So That pleasant, earthy scen...

Petrichor (/ˈpɛtrɪkɔːr/) is the earthy scent produced when rain falls on dry soil. The word is constructed from Greek petra (πέτρα), "rock", or petros (πέτρος), "stone", and īchōr (ἰχώρ), the fluid that flows in the veins of the gods in Greek mythology. 

Petrichor is the term coined by Aust...

So plants and mud have a smell just like your ice-cream so when the water droplet touches the mud and makes it wet 

When lightning strikes,diatomic molecules of oxygen and nitrogen (containing 2atoms) are split, and rearrange to create nitric oxide (NO)and ozone, or O3. Ozonemolecules are c...

And also 

During dry weather, plants produce compounds that accumulate in between rocks and in soil. When it rains, these compounds are released into the air to add to the earthy smell of petrichor 

It also used the help of 

Stearic acid and palmitic acid they are common plant o...

In 2015, scientists from the Massachusetts Institute of Technology (MIT) used high-speed cameras to record how the scent moves into the air. The tests involved approximately 600 experiments on 28 different surfaces, including engineered materials and soil samples. When a raindrop lands on a porou...

Raindrops that move at a slower rate tend to produce more aerosols; this serves as an explanation for why the petrichor is more common after light rains. Actinomycetes is the bacterium responsible for producing spores in soil.

So in conclusion we got to learn a lot about the smell of rain or petrichor so I hope you enjoy the lesson and I will meet you again later