Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by Hemant Singh , an ibibo Master, at 1:43 PM on August 01, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by R.P. Singh , an ibibo Master, at 6:18 PM on July 24, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by Rocky , an ibibo Master, at 12:02 PM on July 22, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by ashish Yadav , an ibibo Wizard, at 2:44 PM on July 21, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by Raksha , an ibibo Master, at 1:29 PM on July 17, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by Yash , an ibibo Master, at 8:37 AM on July 16, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by Ni .. , an ibibo Master, at 6:38 PM on July 15, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.a bout. com/od/cloudsandprecipitation/ f/clo udformation.htm

Answered by Sharad Singh , an ibibo Master, at 2:25 PM on July 15, 2008

Water molecules must have a surface on which to collect. The air is constantly full of water. When you look into the sky and see a cloud, it is actually moisture you are seeing. Most of the time, water vapor in the air cannot be seen unless it collects and condenses to form a cloud.

Clean air (without any dust or particles) will not produce clouds without supersaturation (or relative humidity above 100%). Luckily for us, Mother Nature and humans put lots of Cloud Condensation Nuclei or dust into the atmosphere. This dust comes from sources such as volcanoes, cars, sea spray from the ocean, and fires. Other particles in the atmosphere, including bacteria, can also play a role in serving as condensation nuclei.

When temperatures or pressures decrease, the air cannot hold as much water. Go to the dewpoint temperature definition to see a great diagram of relative humidity and dewpoint temperature. The lower the temperature, the greater the condensation of gaseous water to liquid water. Note: I have simplified the language on air "holding water", but there are inherent misconceptions that can be developed as a result. Please read Relative Humidity Misconceptions for a full explanation of the physics of relative humidity.

Once the stage is set, cloud formation happens as water coalesces (or joins together). Now, learn to simulate cloud formation by making a cloud in a bottle.

For more information-
http://weather.about. com/od/cloudsandprecipitation/f/clo udformation.htm

Answered by Nagendra , an ibibo Master, at 7:37 PM on July 14, 2008

when water evaporates from rivers, ponds, oceans, and lakes. The air containing this evaporated water vapor rises and expands at higher altitudes where the air pressure is lower. The expanding air cools, and as this cooling occurs, the water vapor condenses (changes) from a vapor to a liquid. Many tiny water droplets form and a cloud is born.

Conditions have to be just right for clouds to form. Nature needs tiny droplets of water, something for the droplets to cling to (particles like dust, salt, or smoke) and the right temperature.

A variety of cloud types form depending upon their height, air movement, and the amount of water vapor and condensation particles.

The basic cloud types include the following:

* Stratus (spread out or layered). These clouds are low to the ground and layered.
* Fog is very close to the ground.
* Stratus clouds may predict rain.
* Cirrus (curly, wispy). These clouds are the highest and are made of ice crystals.

Answered by Madhurima , an ibibo Master, at 2:07 PM on July 14, 2008