Dew

When the ground, dispersing heat by radiation, reaches dew point, the air that is directly in contact with it, condenses and deposits drops of water directly on the ground, and on all the surfaces the air comes into contact with, thus forming dew.
Dew supplies a quantity of water that can be important in some particular situations: where there is no direct precipitation, the vegetation however receives an amount of water that is sufficient for its vital processes. For this reason these are known as occult precipitations, i.e. they are not directly visible. It is not easy to evaluate their quantity, but these precipitations must be taken into account when calculating the ideological balance of the water cycle. In fact dew is partly absorbed by the ground, and a part of it evaporates during the day, and thus becomes part of the water-cycle once again. This type of water supply is fundamental for the survival of plants and animals in arid, semi-desert zones.

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...

    5 September 2022

    The Arctic is warming up four times faster

    The planet is warming due to the greenhouse effect—this is now clear to all of us. What is less well…

  • 23 June 2022

    Climate and the Earth’s volcanoes

    We know that the chief greenhouse gas is carbon dioxide. We also know that the greenhouse effect is the cause…

    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…

  • 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