When did scientists discover that clouds contain water?
440607
Since the prehistoric era. It doesnt take a genius to observe the correlation between rain and clouds. It doesnt rain when there are no clouds. Clouds disappear after a rain.
343483
Your mind is the greatest portal to the past. Beyond that little is presently known about the possibility of going beyond temporal boundries.\n\nThere are 4 types of clouds. It sounds ridiculously simple, but there are low clouds, middle clouds, high clouds, and of course, clouds with extensive vertical development. \n\nThe non-moving cloud may have been in a different layer. The wind does not always blow the same at different heights.\n\nAnother possibility is that the cloud was an artifact of the right combo of temperature, sun and wind relative to a big mountain or lake or some other big geographical quirk.\n\nFor instance, imagine the wind blowing over a lake that is near a mountain. The warm, moist air comes off the lake toward a mountain. Since the wind can't go though the mountain it has to go over. But its cooler at higher levels so the water vapor condenses and you see a cloud. Clouds already in existence would appear to move normally while this one stays put.\n\nHawks are examples of birds that are highly skilled at detecting and taking advantage of rising air currents. Once they find rising air, they can float and float and float upwards and upwards without much need to flap their wings
603703
Cloud reading is a fascinating hobby, and a life-saving ability for sailors, mountain climbers and others who find themselves in the wide open spaces. \nYou need to learn about basic kinds of clouds -- the various types of cumulus clouds,for example -- and how they react in your geographical area. Clouds interact with mountains and with water. They load up when they travel over a body of water (the ocean, a lake, etc.) and when they meet a mountain they have to rise to go over it. So, they drop their water. That gives you rain on one side of the mountain and dry conditions on the other side. \nA good place to learn about clouds is from your local weather center (check the nearest airport for the meteorological station closest to you) or you might even give your local TV weatherman a call.
818829
Scientific theories behind the origins of sea salt started with Sir Edmond Halley in 1715, who proposed that salt and other minerals were carried into the sea by rivers, having been leached out of the ground by rainfall runoff. Upon reaching the ocean, these salts would be retained and concentrated as the process of evaporation (see Hydrologic cycle) removed the water. Halley noted that of the small number of lakes in the world without ocean outlets (such as the Dead Sea and the Caspian Sea, see endorheic basin), most have high salt content. Halley termed this process "continental weathering".
419637
cloud formation occurs when water vapor condenses on particles in the atmosphere which causes a release of latent heat so i would venture a guess that it an exothermic reaction.
30608
Clouds are formed when warm moisture laden air is forced upwards either by a physical obstruction such as a hill/mountain or by being heated by the ground/sun.\nAs it rises it cools, and cold air can hold less moisture than warm air, so the vapour condenses out into droplets that form our clouds.\n\nFog is caused when moisture laden air is cooled by contact with the ground or water, it gets colder and colder until any moisture condenses out.  Fog forms as a layer as the air above it tends to be warmer due to rflected heat from the sun and also becauseof the lack of wind to stir the two layers together.  This is often referred to as an inversion.
36446
A cloud is a visible body of very fine water droplets or ice particles suspended in the atmosphere at altitudes ranging up to several miles above sea level.
630793
Clouds are formed by water vapor. And high pressure can hold more water vapor. So when vapor moves into a low pressure system it condenses and and forms clouds and those clouds precipitate when the system cant hold no more water vapor
471786
It gets cooler as you go higher in the atmosphere. The water vapour in the air condenses on the dust particles forming tiny water droplets. These droplet float in the air. Such clusters of droplets is what we call clouds.
27398
You can observe this yourself by breathing on a mirror. As the condensation evaporates from the mirror, you have completed the water cycle. Water evaporates into the atmosphere from the ocean, lakes, rivers, and from soil and plants, and even from your skin and breath. When the air reaches saturation (100% humidity) due to cooling or changes in atmospheric pressure (or both) the water condenses  from vapor to liquid (or solid) and falls to earth as rain, snow, sleet, hail, or maybe only as dew. This water may then form streams and rivers and return to the ocean where it may evaporate again into the atmosphere or it may sink into the earth where it becomes groundwater that may take many thousands of years to emerge again, or may be pumped to the surface from a well and used for drinking water or irrigation. It is a continuous cycle that may take only seconds or may take thousands of years to complete the cycle depending on the path of the water.   \n\nWhy do I get the feeling I'm answering your homework question? Now if you'd asked about delta O18 (a heavy isotope of oxygen) I could have told you how the water cycle concentrates water composed of hydrogen and heavy oxygen atoms and how this is used to study paleoclimates using ice cores and sea shells. Have a good day.
396389
cirrus, stratus, and cumulus. however, those are just the three most basic forms of clouds. you have cumulonimbus, for example, which are thunderstorm clouds that form from cumulus clouds. does that help or did i confuse you more????????
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Evaporation: Water from a lake, stream or any body of water forms into a gas and rises up into the sky.\n\nCondensation: The evaporated water cools down in the higher atmosphere and forms small molecules. Many of these small molecules stick together to form clouds.\n\nPrecipitation: Once the cloud is too big and can't hold that much water, the water falls down as either rain, hail, sleet, or snow, depending on the temperature.\n\nCollection: The water falls into a body of water and collects there. Then it evaporates into the air again and the water cycle starts all over.
90162
There are many more than 4 types of clouds, but in elementary classes they teach that the 4 types are:\n\n1. cumulus\n2. stratus\n3. cirrus\n4. nimbus\n\n\nIf you want to see a much longer list, I have included a reference. \n\nThis reference lists the following 4 types of clouds:\n\nA. High clouds\nB. Middle clouds\nC. Low clouds\nD. Vertical clouds\n\nI am not sure that this is a particularly useful classification system. \n\nI find it interesting that there is still a lot we do not know about clouds. Clouds can both heat and cool the surface. Not all clouds are even composed of condensed water vapor. Current theories of the ozone depletion mechanism rely on the existence of stratospheric polar clouds that are probably not composed ice crystals, but  nitric acid and water, probably in the form of crystals of nitric acid trihydrate ("NAT"), HNO3.3(H2O) (see second reference).
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Clouds form when the invisible water vapor in the air condenses into visible water droplets or ice crystals. This can happen in three ways.\n\n1. The air is cooled below its saturation point. This happens when the air comes in contact with a cold surface or a surface that is cooling by radiation, or the air is cooled by adiabatic expansion (rising). This can happen\n\nalong warm and cold fronts (frontal lift), \nwhere air flows up the side of a mountain and cools as it rises higher into the atmosphere (orographic lift), \nby the convection caused by the warming of a surface by insolation (diurnal heating), \nwhen warm air blows over a colder surface such as a cool body of water. \n2. Clouds can be formed when two air masses below saturation point mix. Examples are breath on a cold day, aircraft contrails, and Arctic sea smoke.\n\n3. The air stays the same temperature but absorbs more water vapor into it until it reaches saturation.\n\n\nand there's lots more at....
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Chlorine (Gr. χλωρος, greenish yellow) was discovered in 1774 by Swedish chemist Carl Wilhelm Scheele, who mistakenly thought it contained oxygen. Chlorine was given its name in 1810 by Sir Humphry Davy, who insisted that it was in fact an element.\n\nChlorine gas was first used as a weapon against human beings in WWI on April 22nd, 1915.
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One of the earliest attempts to explain the nature of water was made by the Greek philosopher Aristotle in 335 B.C. when he issued his Theory of Matter. According to Aristotle's theory, every substance was a combination of four basic elements—fire, earth, air and water. This idea was to keep alchemists busy for centuries trying to change common metals into gold by rearranging their "elements." They were not very successful, however, since no one was ever able to break down a substance and find out just how much fire, earth, air and water was in it. Not until the eighteenth century did scientists decide that air, earth and fire were not really elements at all, and in 1781 a British chemist proved that water wasn't an element either.\n\nThat year Joseph Priestley exploded a mixture of air and hydrogen in a bottle as "a mere random experiment to entertain a few philosophical friends," and noted with interest that the explosion caused moisture to condense inside the bottle. He repeated the experiment until he was certain that the moisture was produced from the reaction of air and hydrogen, thereby proving that water, rather than being a basic element, was itself composed of other chemicals.\n\nIn 1783 the French chemist Antoine Lavoisier elaborated on Priestley's experiment and discovered that the hydrogen was not combining with air to form water, but only with the oxygen in air. Further experiments determined that a molecule of water contained two atoms of hydrogen and one atom of oxygen, a chemical combination which has been given the symbol H2O.\n\nThe discovery that water was H2O or "hydrogen oxide" raised more questions than it answered, for chemists learned that despite its apparent simplicity water is actually a most puzzling and paradoxical substance which seems to defy the rules of chemistry.\n\nCompared to other liquids, water requires a great deal of heat to raise its temperature even a few degrees, and once it is warm it loses its heat slowly. This ability to "store" heat enables water to modify the world's climate. Oceans don't warm up as fast as the coastlines they touch, nor do the)' cool off as fast, with the result that coastal areas usually have milder winters and cooler summers than areas inland. For example, Bismarck, North Dakota has average temperatures of 8 degrees in January and 70 degrees in July, while Seattle, at the same latitude, has averages of 41 degrees and 66 degrees for the same two months.\n\nWater is the only substance found abundantly in all three natural forms—liquid, solid and gas. But in changing from one form to another some more peculiarities become evident. One of water's most paradoxical qualities is that when it changes into a solid it expands (and so becomes relatively lighter for its volume). Other substances, with the exception of bismuth, contract or condense and so become relatively heavier. Of course, if water condensed when it froze the world would have some serious problems. Ice would form on the bottom of a lake because it would be denser and therefore heavier than the liquid water. And there it would stay, growing upwards, killing all marine life. Underneath the surface, shielded from much of the sun's heat, very little of it would melt in the spring and eventually the rivers, lakes and seas in cooler parts of the world would become solid ice.\n\nThe world would have different but even greater temperature problems if there were no water vapor in the air to absorb the sun's heat during the day and retain it during the night. Daylight hours would be miserably hot, and nightfall would bring freezing temperatures. In southern states where winter crops are grown, farmers dread a cold, dry, clear night for this same reason. Without clouds and moist air to act as insulation, the earth's heat quickly escapes, permitting the temperature to drop unusually low and sometimes ruin citrus fruit and tender pl
447613
All types of clouds can be found throught the year in St. Paul, Minnesota. I can't name them all, but go to the weather channel. They have all kinds of information.