Where does the water go when it dries up? Detailed answer

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Where does the water go when it dries up? Detailed answer

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Where does the water go when it dries up?

Looking out into the street or looking at the road, you saw water there. One hour of bright sunlight - and the water disappears! Or, for example, laundry hung on a line dries out by the end of the day. Where does the water go? We say that water evaporates. But what does this mean? Evaporation is the process by which a liquid in air quickly becomes a gas or vapour. Many liquids evaporate very quickly, much faster than water. This applies to alcohol, gasoline, ammonia. Some liquids, such as mercury, evaporate very slowly. What causes evaporation? To understand this, you need to understand something about the nature of matter.

As far as we know, every substance is made up of molecules. Two forces act on these molecules. One of them is the bond that draws them to each other. The other is the thermal movement of individual molecules, which causes them to fly apart. If the adhesive force is higher, the substance remains in a solid state. If, however, the thermal motion is so strong that it exceeds cohesion, then the substance becomes or is a gas.

If the two forces are approximately balanced, then we have a liquid. Water, of course, is a liquid. But on the surface of the liquid, there are molecules that move so fast that they overcome the force of cohesion and fly away into space. The process of escape of molecules is called evaporation. Why does water evaporate faster when it is in the sun or heated? The higher the temperature, the more intense the thermal movement in the liquid. This means that more and more molecules are picking up enough speed to fly away.

When the fastest molecules fly away, the speed of the remaining molecules slows down on average. Why is the remaining liquid cooled by evaporation. So when water dries up, that means it has turned into a gas or vapor and has become part of the air.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is mold?

Sometimes it seems that nature constantly opposes man, making his existence difficult. It seems that insects and plants tend to emerge victorious in the fight against humans.

Let us imagine that we are not doing anything, and various phenomena will immediately fall upon us, trying to harm us or our property. One such pest that is hiding and waiting in the wings to attack is mold.

Leave your leather item, cooked food, or fruit jam out in the open instead of putting it in a cold, dry place. And soon there will be mold.

Most often this happens with a piece of bread.

If left in a warm, damp place for several days, the bread will become covered with a whitish cobweb-like coating, as if powdered with black dust.

If this substance is placed under a microscope, we will see that the cobwebs consist of many colorless fibers that have two types of processes. Some end in tiny black balls containing spores. Others - in short - penetrate the bread, being a kind of roots, and extract nutrients. This is mold.

Mold thrives in damp, warm places, especially where there are sufficient nutrients. As a rule, mold appears on dead plants and animals, such as mucosal mold. Other types of mold are parasites that live on living organisms. We often use the generic term "mold" for them.

There are two types of mold. One type reproduces on the surface of leaves, branches, flowers and fruits of plants and trees. Downy mold develops inside plants. It particularly affects potatoes and grapes and is difficult to control.

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Lawn mower against crime 08.03.2018

Researchers from Columbia University (USA) found that tidying up wastelands in poor areas of the metropolis significantly reduces the level of crime in these areas.

Abandoned plots of land, overgrown with grass and littered with garbage, make up to 15% in US cities, scientists have calculated. Often such wastelands are chosen by criminals for drug trafficking and consumption, for escape and shelter from the police.

Scientists, together with the Pennsylvania Horticultural Society and the Philadelphia Department of Housing, decided to try to clean up these areas and see how such changes would affect the crime rate in nearby areas.

Specialists managed to put in order hundreds of wastelands. Some of them underwent large-scale processing - they were cleared of debris, the soil was leveled, new grass was planted, small fences were put up around the perimeter. On others, only garbage was removed and the grass was mowed. Next, the scientists compared data on crime in the areas where the work took place, and where the wastelands remained the same as before. To do this, they studied police reports and conducted a survey of residents of the areas closest to the wastelands before and after improvement.

Even a minor improvement helped to reduce crime somewhat, by about 10%. In areas where the population lived below the poverty line, this figure was already 13%, and crimes with the use of firearms decreased by 30%. Residents of the districts also reported that they began to feel more secure.

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