The Telegraph
Wednesday , December 1 , 2010
 
IN TODAY'S PAPER
WEEKLY FEATURES
CITIES AND REGIONS
ARCHIVES
Since 1st March, 1999
 
THE TELEGRAPH
 
 
Email This Page
TELL ME WHY

Some clouds are flat at the bottom. Only cumulus clouds have that feature. These clouds form through convection — a process where warm and air rises as it is less dense, and therefore lighter. As the warm air rises, it cools down. By the time it reaches the “dew point temperature”, it is so saturated that it starts condensing into small droplets. That is when and where the cloud is born. Since the condensation starts at the same conditions at the same altitude, the cloud grows from the same height, making the bottom almost flat.

Top
Email This Page