Probably everyone have sometime looked up at the clouds. But what is a cloud ? Clouds is a cluster of cloud droplet mainly consisting of condensed water. A cloud often consists of billions of small cloud droplets, that has been developed because that the air can't take care of more water vapor. When the air is over saturated, water vapor will condense on small particles called aerosol like salt or dust particles.
Because of physical laws that I won't talk about water vapor generally needs those aerosols to condense from vapor to droplets. Depending on the temperature and the amount of excess water vapor in the cloud and the type of particle the droplet will grow differently.
The amount of water vapor the air can hold depends the temperature of the air. For warmer temperature the air can hold more water vapor. With temperature decreasing with altitude, the air will hold less water higher up in the atmosphere. This means it less likely that a cloud spontaneous appears in the sky. Usually clouds develop because of sudden upward movements in atmosphere.
During the cloud droplets life it will travel upwards until gravity gets to strong, upwards winds is generally not the same in the whole cloud. In some cases the droplet will reach the top of the cloud and start falling down collection smaller cloud droplets. Depending on the upward wind the droplet might stop its fall and either travel upwards or hang still in the cloud.
Sudden upward movement can be caused by several things, usually it is convection or frontal clouds you see in the sky.
We have know learned how a cloud is born, but what happens when it's raining?
In a cloud we have certain upward winds that is working against gravity that wants to push the droplets against the grown. When our droplets reach a certain size they are too big and the gravity wins and our cloud starts to rain.
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//Osced
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