What is Ozone Layer

Ozone layer entiregrade

The ozone layer is the layer of atmosphere present in between 19-48 km in the stratosphere.

Ozone is a pale blue gas which is made up of three oxygen atoms and its molecular formula is O3.

Ozone is highly poisonous and has a strong odour.

First, it’s presence in the atmosphere was explained by Chapman in 1930 AD.

When atmospheric oxygen (O2) present in the atmosphere influences by ultraviolet rays of the sun, it dissociates into nascent oxygen (O).

The nascent oxygen then combines with O2 to form ozone (O3).

Let’s have a look at its illustration by the following equations:

O2 —–UV rays—–> O + O

O + O2 —-UV rays—> O3

When ozone layer absorbs ultraviolet rays having wavelength lesser than 340 nm, they dissociate into oxygen gas (O2) and nascent oxygen (O). The nascent oxygen forms oxygen molecules later.

Let’s have a look at its illustration by the following equations:

O3 —-UV rays—-> O2 + O

O + O —UV rays—-> O2

In this way, a continuous formation and destruction of ozone balance the thickness of the ozonosphere.

Effects of the ozone layer

The ozone layer protects us from a severe burn by absorbing ultraviolet rays of the sun. Thus, the Ozone layer is very important for us.

Due to absorption of the ultraviolet rays, the stratosphere has more temperature at the upper surface. The ozone layer plays a vital role in balancing of weather and temperature on the earth.

Ozone is useful to us only when it is in the stratosphere. If it comes in troposphere i.e. close to the earth’s surface, it is very harmful to us.

If ozone’s amount is 0.3 ppm (parts per million) in the air, it causes throat burning and when it exceeds that amount, it can destroy the lungs very badly.

Ozone Layer Depletion

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