Clouds

A cloud is a visible mass of droplets or frozen crystals floating in the atmosphere above the surface of the Earth or another planetary body. A cloud is also a visible mass attracted by gravity.

When you hear a weather report that forecasts scattered showers, you might wonder what you can expect. Usually it means that some parts of your area will have rain from time to time during the day or night. Some of the rain might fall where you are, and some of it will fall somewhere else. It will be scattered through the reporting area.

Consider the way a refrigerator works: a gas (refrigerant) is compressed and it gets hot, this passes through the hot coils at the back of the fridge to cool down. The cool compressed gas is then allowed to expand suddenly through a nozzle in the freezer, and the gas gets very cold, which makes the freezer cold. The gas then returns to the compressor for re-compression and completes the cycle.

Assume you had an insulated floppy balloon of air (as in a gondola balloon) at sea level at 20 degrees centigrade, at the same pressure as the surrounding air. You then carry the big floppy balloon to the top of Everest. The air pressure in the atmosphere decreases the higher you go up because less air is pushing down on you the higher you go up. Because the air pressure is lower, and the air in the balloon expands (it was a very floppy gondola balloon, and can expand freely). As we saw with the refrigerator, when a gas expands, it gets cold! Hence the air in the balloon will be much colder than at sea level, as is all the air around it.

See also: http:/en.wikipedia.org/wiki/High_altitude

Lighting is most frequent in thuderstorms, so the largest percentage occur in tropical climates. There are nearly as many in the ocean as on land, and they are particularly numerous during tropical storms.

It would be a stationary front.

The sun evaporates water from the Earth and it turns into water vapour. Water vapour rises up into the sky and forms clouds. When the clouds get heavy (means a lot of evaporation), water falls form the sky as rain. The water comes from the clouds. (clouds are not gases. They are solids)

A saxophone is playing a steady note of frequency 210 Hz. The temperature in the room is 25 C. Suppose that, at some instant, the varying pressure at your eardrum is at a maximum. How far away (in meters) is the next pressure maximum?

If anyone can help me with this, I would appreciate?

The speed of sound at 25 C = 343m/s

wavelength = speed of sound / frequency

wavelength = 343m/s / 210/s = 1.6m

Therefore, the distance of the next pressure maximum is 1.6m away from your ear drum.

As a solid changes into a liquid, the particles gain energy and start to vibrate more rapidly and in a less ordered manner. This increased movement causes the particles to break free from their fixed positions, allowing them to flow past each other, resulting in the transition from a solid to a liquid state.

West to east.

West to east.

I would say west to east or left to right

Actually,clouds form when water evaporates from rivers, ponds, oceans, and lakes. The air containing this evaporated water vapor rises and expands at higher altitudes here 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. They may predict a change in weather like a coming storm. * Cumulus (heaped or piled up). Cumulus clouds are puffy with flat bottoms. * Cumulus clouds usually predict clear weather. There are many types of clouds in the sky. Did you know that some of them are man-made? "Contrails" are the long, thin clouds that are left by airplanes as they fly past. Contrails is short for "condensation trails." They are clouds that planes make. Contrails are man-made. They have a cousin that almost everyone has seen. Have you ever gone outside on a cold day? Have you seen a cloud come out of your mouth? That little cloud is made by water vapor that is usually invisible. In cold weather, the vapor condenses into a cloud you can see. Contrails are made the same way. A plane has an engine. The exhaust from the engine has water vapor. Temperatures are colder at higher altitudes. Water vapor condenses into ice crystals. This leaves the white lines you see behind planes. Sometimes, there is water in the air around the plane. This can make the contrail even bigger. If there is not a lot of water in the air, the contrails will not last long. When there is a lot of water in the air, the contrails will last longer. Ice from the plane will join water in the atmosphere. This will make a long contrail behind the airplane. It will stay in the sky long after the plane is gone. They can last for hours! They can even grow. They can get as big as football fields. They can spread until they turn into cirrus clouds. Contrails are made of water vapor. They do not hurt humans. NASA is trying to see if contrails may hurt the environment. Contrails are man-made clouds. They add to the Earth's cloud coverage. They might change temperatures and climates. We see a lot of contrails wherever there is heavy plane traffic. Air traffic keeps getting busier. Scientists are looking into what contrails might do. NASA might find that contrails hurt the environment. NASA wants to stop this from happening. One way would be to have planes fly away from problem areas. Another way is to make better engines. NASA is working with partners to make better jet engines. Someday, you might not even see contrails behind planes!

A weather front typically forms when both warm and cool air meet. Both the difference in air temperature, as well as the density of the air, can cause a front. Warm fronts are more slow moving than cold fronts and usually produce precipitation.

Fronts are depicted on weather maps with arrows showing where the front has come from and what direction the front is moving.

No, the more water vapor the air contains, the lighter it is. When water vapor enters the atmosphere, it pushes out an equal volume of dry air. A cubic meter of dry air is 99 percent nitrogen and oxygen. A cubic meter of humid air with 2 percent water vapor is only 97 percent nitrogen and oxygen. Water vapor is lighter than the nitrogen and oxygen it pushed out. Therefore, humid air weighs less than dry air and exerts less pressure.

Air masses on the planet are in constant motion. The air's motion is driven by differential pressures generated by differential heating and cooling of the earth. Contributing factors are Coriolis forces and already moving air columns like the jet streams. This is a simplified explanation, but it provides a basic idea that can be enhanced with further reading. Links are provided to related articles posted by our friends at Wikipedia, where knowledge is free.

When a gas is heated, it gains energy and its particles move faster. To condense a gas into a liquid, the gas needs to lose energy, typically by being cooled down. This causes the gas particles to slow down and come closer together, forming a liquid.

Doppler weather radar is used to detect microbursts. This radar technology can identify the presence of strong downdrafts associated with microbursts by measuring the velocity and direction of wind. By analyzing these radar data, meteorologists can issue timely warnings to help prevent potential hazards to aviation and other affected areas.

Thermochromic plastics can change color in response to changes in temperature, such as exposure to heat or cold liquids. These plastics contain pigments that are sensitive to temperature variations, causing the color change.

It is still possible to be pregnant even if you do not have sore or swollen breasts or have not missed your period. Symptoms such as fatigue, nausea, sensitivity to smells, headaches, and bloating can also be signs of pregnancy. Consider taking a pregnancy test to confirm.

The two main types of vaporization are evaporation, which occurs at the surface of a liquid at any temperature, and boiling, which occurs throughout the bulk of a liquid at a specific temperature called the boiling point.

the temperature of a basketball effects it's bounce because the air partacles in the ball slow down causing it to lose pressure and it doesn't bounce as well. if a ball has more pressure it bounces better.

You can add the iodine crystals to Ammonium hydroxide to form a paste that will explode into reddish smoke when aggrivated. I read somewhere that a few drops of Turpentine will produce a similar result.

Water is formed when two parts Hydrogen bond with one part Oxygen. Water is formed and destroyed in many locations including plants during photosythesis, in stellar supernovae, and through other chemical and nuclear reactions.

In very basic terms, winds pick up moisture from waterways and oceans. This moisture as ions, hydrogen and oxygen, collect in the clouds. When enough ions form, we can have rain showers to thunderstorms with or without hail, or in winter, we have sleet to snow. The rain runs off into waterways and oceans and some evaporates from the ground surfaces. Again, winds pick up moisture, carrying it in the clouds and the cycle continues.

Communities developed dams and reservoirs to collect rainwater, plus accessing rivers and streams. This feeds water treatment plants that deliver water through pipes to homes and businesses.

i think the trees and the ground may have a neutral charge bfore clouds form then they become positively charged when negative charges form at the lower portion of the cloud.

Hail occurs when thunderstorms get real cold, and then all that water in the clouds gets more colder. The more it gets colder, it freezes, then turns into hail. Sometimes, hail rain can be big as a golf ball or a handball!