Education rain clouds
Cloud formation begins with the process of evaporation that occurs in nature all the time.The sun heats the ground and water, and thus accelerates evaporation.Break away from the surface of the water droplets are so small that they are held above the ground warm air currents.Easy transparent vapor is mixed with air masses and with them point upwards.
Meanwhile, water evaporation from the soil surface and water continues.Wind knocks with small flocks of fog.Formed cloud.Tiny droplets of water vapor moving erratically, som
etimes they merge and become larger in the collisions.However, this is not enough to rain started.
For this to happen, the drops should be large and heavy so that the rising air can not hold them.One raindrop turns at merge with millions of other cloud droplets.This is a very long process.
Rain clouds form in the troposphere - the layer of the atmosphere nizhem.The troposphere is heated from the ground, so the temperature at the surface of the planet is very different from the temperature of a few kilometers on it - it falls by an average of 6 ° C per kilometer climb.Even in the summer heat at an altitude of 8-9 km above the Earth reigns downright arctic cold, and the temperature of -30 ° C are not uncommon.
processes taking place inside the cloud
water vapor rising up with the flow of air gradually cools down, and then freezes, turning into tiny ice crystals.Thus, the top of rain clouds are ice crystals, and the bottom - the water droplets.
inside the cloud condensation of water vapor.As you know, this process is only possible if there is any surface.Water vapor is deposited on the droplets of water, all kinds of dust particles and mote, raised upward air currents, as well as ice crystals.The size and weight of the crystals increases rapidly.They can no longer be kept in the air and break down.
When passing through the thick clouds of ice crystals become more and more significant, since condensation continues.If the cloud base temperature above zero, icicles melt and fall to earth as rain, if the minus - is hail.
And then it all starts again.Numerous rain flows form streams that replenish the earth ponds.Some of the precipitated water seeps through the soil and into underground reservoirs.A portion of the water evaporates and forms a cloud above the ground.