To clean their spectacles people often breathe out on glasses to make them wet. Why??????  Answer fast.

 when we breathe out  on glasses of spectacles,the moisture of our mouth settles on the surface of glasses which cools down(condensation) & forms tiny droplets to make it wet,which helps us to clean the spectacles.

I HOPE THIS ANS. WILL HELP U. 

to kepp clean

What is hige Pleas tall sir

 Why can we not use see water for our daily use.

when we breath out on the glass,the water vapour touches the glass and turns into drops of water because of condensation and it becames easy to clean the glass