Knowledge N Fact4u

Clouds are just water vapor , so why do they move ? •Clouds are not water vapor. Water vapor is the gas state of H 2 O and is invisible.  •The air around you on a humid summer day is chock full of water vapor, but you don't see any of it.  •On the other hand, there is very little water vapor in the air during the cold of winter, yet you can easily make clouds with your breath.  •Clouds are collections of liquid water droplets or ice that are small enough to float.  •When the water vapor in the air gets cold enough, it condenses back into liquid in the forms of droplets.  •But the condensation is not automatic. It takes a bit of matter – a condensation nucleus – in order to jump start the process. Dust, salt, and ice in the air do the trick by providing a surface for the water to condense on to.  •Clouds are white because the water droplets making the cloud are the right size to scatter light resonantly according to Mie scattering.  •Mie scatte...