Question

report on heavy rainfall in your district

Answer 1

Answer:

Explanation:The presence of warm, moist and unstable air and sufficient number of hygroscopic nuclei are pre­requisite conditions for rainfall. The warm and moist air after being lifted upward becomes saturated and clouds are formed after condensation of water vapour around hygroscopic nuclei (salt and dust particles) but still there may not be rainfall unless the air is supersatu­rated.

The process of condensation begins only when the relative humidity of ascending air becomes 100 per cent and air is further cooled through dry adiabatic lapse rate but first condensation occurs around larger hygroscopic nuclei only. Such droplets are called cloud droplets.

The aggregation of large number of cloud droplets forms clouds. These cloud droplets are so microscopic in size that they remain suspended in the air. Rainfall does not occur unless these cloud droplets become so large due to coalescence that the air be­comes unable to hold them.

This is why, sometimes the sky is overcast by thick clouds but there is no rainfall. If by chance these cloud droplets fall downward they are evaporated before they reach the ground surface. Rainfall occurs only when cloud droplets change to raindrops.

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