A cloud is a visible body of very fine water droplets or ice particles suspended in the atmosphere at altitudes up to several miles above sea level. They are generally produced by the condensation of water vapor. Other clouds, less commonly seen, are composed of smokes or dusts.

21,976 Questions
Meteorology and Weather

Why are clouds white?

The whiteness of the clouds is due to light of all colors being dispersed by the water/ice of the clouds. Clouds quite a distance away appear yellow due to the blue wavelengths being dispered more than the yellow and red wavelengths by the air and particles in the air (the 'clear' sky is blue!)

Not all clouds are pure white, however, for those that are white, it is due to their altitude and the reflection of sunlight.

For example, a cirrus cloud has an altitude of approximately 8km above sea level. At such extreme altitudes all high-level clouds are made up only of ice crystals, as the water vapor from which they are initially formed has frozen.

The ice crystals reflect sunlight. When flying above clouds during the day, they are always bright white. When we get dark clouds, they are so thick that they soak up most of the sunlight or reflect it upwards, and so things aren't as bright below. Storm clouds are the thickest clouds, and look the darkest from down below, though they still look bright white if we see them from above.

Gray color of the clouds is caused by higher clouds casting their shadow on lower-based clouds, or that the clouds are so dense that their top parts absorb most of the sunlight, casting their own shadow along their base, making them dark on the bottom.

Meteorology and Weather

What is the boundary between two air masses of different temperature humidity or density called?

The line where these two air masses meet is called a front.

  • If cold air advances and pushes away the warm air, it forms a cold front.
  • Cold fronts are associated with rain following the front itself.
  • When warm air advances, it rides up over the denser, cold air mass to form a warm front.
  • Warm fronts are associated with rain leading the front itself.
  • If neither air mass advances, it forms a stationary front.
  • If dry air advances into moist air and there is no significant temperature difference, it forms a dry line.
  • It is not uncommon to see severe thunderstorms develop along cold fronts and dry lines.

Is a banana a gas liquid or solid?

A solid.

Meteorology and Weather
The Difference Between

What is the difference between a cold front and a warm front?

Cold fronts are defined by cold air advancing, sliding under and displacing warmer air - they are steeper and move more quickly.

Warm air cannot displace cold air easily because it is less dense. Therefore, it rides up and over it, producing stratus and nimbostratus clouds where light precipitation falls.
the boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system.

Football - American

Why are the quarterbacks always white?

the quater backs are always white because no black man wants to be quater back

Air Conditioning and Coolant
Heating Ventilating and Air Conditioning

Why does your home central air conditioner run but not blow cold air?

do you have your a/c set to fan? not a/c? otherwise you might need to contact your local a/c repair man and e will tell you you need a charge of freon in your system.


Why not to start checking the simple points like the filter, duct mechanism, etc.

Not so simple to give a "One Size Fits All" answer for but here are a few things to check.

1) when the system is running does the outside unit kick on? That is the condensing unit and supports the compressor which ultimately provides the cooling to the coil in the unit inside.

2) is the air filter dirty or do you have low air flow if so check the lines at the outside unit see if they're frosting or icing up. If they are try the air filter but if that still doesn't solve the problem call for service a low freon charge will cause icing.

3) if you have low flow but a clean filter check the "MERV" rating on the filter a merv 6-8 should be sufficient for most applications except cigarette smoke. The lower the merv # the less the resistance to air flow the larger the particle rating that it will filter in microns.

4) There are other components which can require servicing but they are normally handled by your service person unless you are familiar with HVAC repair. Have a Great day.

Earth Sciences
Planetary Science
Planet Mars

What is Mars made of?

Mars is made of rock and iron oxides. It's surface is covered in mountains, volcanoes, valleys, ice caps and dried up river beds. Mars is also very dry like a desert. It is also red because of the iron oxide in the pulverized rock dust.
Mars is a planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the volcanoes, deserts and polar ice caps of Earth.

Rain and Flooding
Weight and Mass

How much do clouds weigh?

To calculate the weight of a cloud, you first have to figure out how dense it is. The average density of a cumulus cloud is around half a gram of water per cubic meter. Second, you need to determine how big the cloud is, presumably by measuring its shadow while the sun is above it. A typical cloud is about a kilometer across and roughly cube shaped, meaning it has a volume of one billion cubic meters.

Using this formula, scientists have determined that the average cumulus cloud weighs around 1.1 million pounds.

Meteorology and Weather

List of weather instruments?

The Different Weather Instruments are: Anemometer, Barometer, Wind Vane, Wind Mill, Thermometer, Hygrometer, Ombrometer or Rain Gauge.

Symbolism and Symbolic Meanings

What does leafy sky mean?

i would think that means the sky is very cloudy-- the clouds shaped like leaves


What are three facts about cirrus clouds?

They are very high in the atmosphere - the highest of clouds.

They move rapidly because of the jet streams at their altitude.

They usually foretell a weather front coming in 24-48 hours.

Thunderstorms and Lightning
Snow and Ice

Is hail made of ice crystals?

Yes. Hail is composed of ice and ice is a crystalline solid.


What is the boiling point of hydrogen gas at STP?

1) Hydrogen GAS does not boil, simply because a gas is beyond the boiling stage.

2) STP (Standard Temperature and Pressure) is a set variable. Therefore, this question is syntactically incorrect, because you are asking: What is the boiling point of 'substance' at X°C and X psi, in which case you can't answer because of the already given temperature.


Just for two other ways that are similar to your question that can be answered are...

Q: What is the boiling point of hydrogen at SP?

A: Roughly 20K, yea really cold.


Q: Does hydrogen boil at STP?

A: No...


The boiling point of liquid hydrogen is - 252,87 0C (or 20,28 K) but of course not at STP !

Meteorology and Weather

How do wind currents affect the earth?

it effects the climate of neighboring regions.

Thunderstorms and Lightning

Can an isolated thunderstorm become a tornado?

A thunderstorm does not become a tornado. It can produce one.

Yes, though. If the atmosphere is unstable enough and there is enough low-level wind shear, then an isolated storm can produce a tornado.


What is a four winds shotgun?

It's possible to make a shotgun from common steel plumbing parts. It takes four parts and can not be identified as a firearm when disassembled. So you can throw the parts to the four winds and nobody can charge you with possessing a firearm.

Eyjafjallajökull Volcano

Does the ash cloud have carbon dioxide it it?

definition of ash : ash is a residual product after any combustion process after a perfect combustion of any fuel we get ash hence it is a product which not have any combustible product in it . that's why i think ash does not contain carbon compound because carbon is highly combustible . in this world everything contain carbon inside it but i think ash is a alone example of non carbon product...may b it contain very few amount of carbon but after again burning it does not have any carbon . i think so.


Is a balloon a solid liquid solid or a gas?

Balloons are solids. They are filled with gases.


What element is what a cloud does?

Periodic Table Puns answer "What a cloud does..."

Urainium (U)


Chemistry puzzle answer "What a cloud does..."

Rhenium (RE)


What does condensed mean in science?

Condensation is the opposite of evaporation. It takes place when water vapor in the air condenses from a gas, back into a liquid form, and leaves the atmosphere, returning to the surface of the Earth.

Usually in order for condensation to take place, the atmosphere must be fully saturated. In other words, the maximum vapor pressure must have been reached.

In addition to being saturated, the nature of water requires that their be a surface upon which water can condense. This surface might be blades of grass, or windows. In the atmosphere condensation often takes place around dust particles, or other particulates such as smoke, and even microscopic bacteria


Why the quartz is isotropic solid?

This is because it belongs to the cubic group of minerals where the refractive index of light is common in all orientation.

The velocity of light is the same in all directions.


What is the boiling point of methanol at different temperature?

is this question right framed? Is it like " What is the boiling point of methanol at different pressure?"

How anybody can understand that Boiling point temperature at different temperatures.


Where was charlie st cloud made?

The movie was filmed in Vancouver, Canada.


How does gas change into liquid water?

gas is turned into a heaver mass and there for turns into a liquid.;P


What kinds of clouds form tornadoes?

Technically, it's a process of multiple cloud levels. Tornadoes form from Funnel Clouds, which form from Wall Clouds, which form along the base of Cumulonimbus clouds. So you start with a Cumulonimbus cloud (also known as a thunderhead or thunderstorm cloud) and a wall cloud can form along the base it. A wall cloud is a lowered base of a storm that is rotating.

Attached to several wall clouds, especially in moist environments, is a tail cloud,which is just a band of clouds that resemble a tail. Most often the wall clouds' movement will be horizontal and in other clouds may be seen as moving in toward the wall cloud. There is also sometimes something called a collar cloud atop the wall cloud which is a band of clouds circling over it. Wall clouds will usually will slope inward, or toward the precipitation area.

From that wall cloud, a smaller lowering of rotation can occur, often in a funnel shape, known as a funnel cloud. If that funnel cloud reaches the ground, it's known as a tornado.


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