D.3. Precipitation
The process of continuous condensation in free air helps the condensed particles to grow in size. When the resistance of the air fails to hold them against the force of gravity, they fall onto the earth’s surface. So after the condensation of water vapour, the release of moisture is known as precipitation.
Sleet is frozen raindrops and refrozen melted snow water. When a layer of air with a temperature above freezing point overlies a sub-freezing layer near the ground, precipitation takes place in the form of sleet. Raindrops, which leave the warmer air, encounter the colder air below.