Rain

Precipitation includes all forms of additional water, in the liquid or solid state, that fall or form on the Earth’s surface.
They can be subdivided into direct precipitation, such as rain, snow and hail and occult precipitation, such as dew and frost, that do not derive from clouds but form directly on contact with the Earth’s surface.
Liquid precipitation, or rain, takes place when drops of water present in a cloud grow bigger and bigger until they are too heavy to remain in the cloud and therefore fall to the ground.
The mechanisms by which the cloud drops grow bigger are several: by absorbing water in an over-saturated atmosphere or, specially by coalescence, that occurs when drops collide against each other on falling.
The limit that separates cloud drops from rain drops is around 100 micron, but generally rain drops are much bigger, at times greater than 2000 micron.

Special reports

  • 29 April 2020

    Lightning

    Man has always been afraid of lightning, in fact in the past lightning was considered a sign of the anger…

    23 October 2017

    Carbon Footprint

    A very special footprint...

    10 February 2020

    Coral turns pale!

    The coral reef is one of the ecosystems with the richest biodiversity...

  • 15 November 2021

    How did Cop26 end?

    On Saturday afternoon in Glasgow, representatives of more than 200 countries attending the COP26 United Nations climate change conference reached…

    5 November 2021

    Cop26, the calendar for the climate conference

    1 November was the first day of the summit, the opening ceremony of which began with a speech by British…

    25 August 2021

    Geo-engineering: a contribution to mitigate climate change?

    Geo-engineering, the science to moderate global warming...

  • 29 April 2020

    Lightning

    Man has always been afraid of lightning, in fact in the past lightning was considered a sign of the anger…

    5 August 2019

    Summer wind

    A sixteen-year-old Swedish girl is braving the wind, cold and rain to take her protest against the changing climate onto…

    17 July 2018

    Tornadoes and waterspouts: phenomena that (also) occur in Italy

    When we talk about tornadoes, our thoughts immediately go to the immense American plains and the area known as “tornado…

  • 29 April 2020

    Lightning

    Man has always been afraid of lightning, in fact in the past lightning was considered a sign of the anger…

  • 23 October 2017

    Carbon Footprint

    A very special footprint...

  • 10 February 2020

    Coral turns pale!

    The coral reef is one of the ecosystems with the richest biodiversity...

From the Multimedia section

Facts