and

What is dew?

All air contains moisture, which is called water vapour. The moisture in the air close to the ground comes from the soil and the plants. When the air cools during the night, the moisture is cooled and water droplets form on the grass and plants.
This is dew.

 

We see the dew early in the morning on grass and hanging from spiders' webs. There is more dew on days when the sky is clear. When it is cloudy, the trees and plants don't get as cold and there is less moisture to form dew.

Dew is dried by the sun's warmth.

What is frost?

Liquid becomes solid when the temperature reaches freezing point, or 0ºC (32ºF). When the temperature falls below freezing point, the moisture in the air freezes into ice crystals and they settle on grass and plants.
This is frost.

 Frost soon melts and the moisture is dried by the sun.

Frost damages plants because the water inside the cells of a plant freezes and breaks the cells' walls. The frozen parts of the plant will die.

 

You can read more about dew and frost here:

http://www.weatherquestions.com/How_does_dew_form.htm

http://yousigma.com/interestingfacts/howisdewformed.html

http://www.bom.gov.au/climate/map/frost/what-is-frost.shtml

http://www.weatherquestions.com/What_causes_frost.htm


Acknowledge this source in your bibliography like this:
Thomas, R. & Sydenham, S. Dew and Frost . [Online] www.kidcyber.com.au (2009)

Other weather pages on kidcyber:
Clouds .. Cyclones & Tornadoes .. Cyclone Tracy .. Ice .. Snow & Hail ,,
Thunder & Lightning .. Wind ... Fun Weather Facts

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