why does it rain?

Answer 1

Rain is an important part of the water cycle. This is the cycle of evaporation, condensation, and precipitation that distributes water all over the Earth. The sun heats the Earth causing water in the oceans and the ground to evaporate. This turns water into water vapor that becomes part of the atmosphere. Next, the water vapor cools and condenses to form clouds. When the water droplets inside the cloud get big and heavy, they fall. That's precipitation, and depending on the temperature, it falls as rain, sleet, snow, or hail. Water that falls to the earth soaks into the ground and feeds lakes and streams. The cycle starts all over again with evaporation of water from the ground and oceans.

Answer 2

Here's a simplified view. Air can store water vapor in it, but the amount it can store is dependent on temperature. Warm air stores lots of water vapor, while cool air stores less. If you take warm, muggy air and start cooling it down, you eventually reach a point where water starts condensing back into the liquid phase. We call this the dew point of the air.

The other trick is simply to know that when we compress a gas it heats up, and when a gas expands it cools down.

So now, we have warm, muggy air at the surface which starts to rise because the density also goes down with temperature. As it rises, it expands and cools. The drop in pressure actually helps it store water, but the associated drop in temperature more than compensates for that affect. Eventually, the rising air cools enough to reach the dew point, and condensation starts around nuclei such as dust particles. From there on, its a matter of the drops increasing in size until their terminal velocity exceeds the velocity of the updraft. Then the drops can fall as rain.

Answer 3

it's a matter of temperatures and air pressure.

first there is water, which evaporates due to a high temperature and the inestability of liquid water (the higher the temperature, the more difficoult for the water to stay liquid).

once it evaporates, its new state (vapor) is less dense, so it is lighter than the air and it can flote over the air.

The bad thing for water is that once it reaches too high, the temperature is low, so it recovers its liquid form and becomes heavy, so it falls back to the ground.

Answer 4

The moisture in the air clings on to each other to form droplets, when these droplets get heavy enough, the droplets fall to the ground called rain.

Answer 5

Are you serious?
Water is evaporated from the ground and then it falls and the cycle starts over... simply put.

Answer 6

I can make it stop, if you like. Just let me know. There's a thingy on here you can e - mail me toot sweet if you want. Remember, I charge for each drop you didn't get. Otay? Good.

Answer 7

Usually, because I just washed my car.

Answer 8

it happens when the clouds cry

Answer 9

So, I can sleep better.