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Do clouds hold water ?

 


In my childhood I used to wonder how clouds are holding tons and tons of water.I know that clouds are just airy particles moving in the sky .But how that gaseous form is holding all the water is a big question to many of us.Let me explain how it actually holds water.

Strictly speaking, a cloud does not fill up with water. First of all, a cloud is not a sponge made out of some other material which soaks up water. The water in a cloud is the cloud. More accurately, a cloud consists of very small liquid water drops or ice crystals suspended in air. The water drops and ice crystals that make up a cloud are floating not because they are soaked up by some sponge-like material that is holding them in place. Rather, the water drops and ice crystals that make up a cloud float because they are so small that the air resistance balances out gravity. To be more precise, the water drops and ice crystals that make up a cloud do not actually float motionless in the sky.

Rather, they are constantly falling very slowly under the influence of gravity and are occasionally lofted upwards by an updraft of wind. This falling and updrafting motion of the drops/crystals that make up a cloud is so slow, and clouds are so big and far away, that it is hard for a casual human observer on the ground to notice this motion. 

When the drops of liquid water or ice that make up a cloud increase in size through collisions and coalescence, they can get so big that the air resistance can no longer counter gravity (when r > 0.1 mm). Such droplets fall down as rain.

Secondly, clouds are not full of water. They are mostly full of air. When we say a bucket is filled with water, we mean that just about every available space in the bucket contains water. In a cloud, every available space definitely does not contain water. The water making up a cloud falls down as rain long before it coalesces enough to fill the entire volume of a cloud. Amazingly, only one billionth of the volume of a cloud consists of water. The rest is air. This means that for every one cubic nanometer of a cloud containing water, there are about a billion cubic nanometers in the cloud that contain just air. 

 A cumulus may have 1000 droplets per cubic centimeter, but these drops are minute and comparatively widely spaced. Water makes up less than one billionth (10-9) of the cloud's apparent volume and contributes only about one millionth of a gram per cubic centimeter to its density." Clouds are definitely not full of water. They are mostly full of air.

How can clouds be so visually striking when they are mostly invisible air? The key is that light reflects off the surface of objects. The more surface area, the more that light gets reflected. It is the same reason that pure solid ice is mostly clear but snow (which is just ice in small complex shapes) is bright white. While a cloud does not contain a lot of water in terms of total volume, the water it does contain is divided among trillions of small droplets, leading to many reflecting surfaces.


Enjoy the beautiful natural resource rain. Remember "WE LIVE ONLY ONCE"

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