Here are four fascinating things you may not know about clouds.
and also depends on things like temperature throughout cloud depth, at what point saturation happens , and the distribution of nuclei .... [+]
at a planned length of 36km, on June 9, 2005 in Cixi of Ningbo City, Zhejiang Province, China. Construction began on the bridge on June 8, 2003 and is scheduled to be completed in 2008 and open to traffic in 2009. The total investment of the project is expected to reach RMB 11.8 billion . There are two factors that explain why clouds do not fall. The first factor is that cloud particles are very small. Because they are so small, they do not have significant fall velocity.
The speed that an object falls is related to its mass and surface area. Wesley notes in that article, “which is why a feather falls more slowly than a pebble of the same weight.” Even the largest cloud droplets do not attain significant fall velocities, and because of their shape, such velocities are even smaller with ice crystals.
OK, so why do the clouds appear to float? The answer is rather simple. There is generally some type of upward motion associated with clouds. In a cumulonimbus cloud with significant hail, these “updrafts” can be quite strong. Even upward motions with more benign stratus clouds are significant enough to offset the fall velocities of the droplets or crystals.... [+]How the water vapor is distributed and density are also important. The U.S.
Sometimes the clouds will appear grey or black. That’s because some of the drops in the cloud have grown to the size of rain drops, which scatter even more light and prevents white light from reaching our eyes.
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