Question

During winter we notice smoke or a small cloud near our mouth. This phenomenon is happening due to a process called ___ .

Answer 1

It is our common experience that on cold winter mornings when we speak,we observe smoke-like vapour coming out of our mouths. This is due a process called condensation .
Reason :
In winter, the air in our atmosphere is very cool as compared to the air coming out from our mouth. Water vapour present in the air coming out from our mouth gets cooled suddenly to form very tiny droplets. These tiny droplets concentrated in a limited area, appear like smoke or a small cloud near our mouth.