Why does water evaporate? Detailed answer

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Why does water evaporate? Detailed answer

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Why does water evaporate?

Everyone knows that if you hang your washed laundry, it will dry. And it is also obvious that the wet pavement will definitely become dry after the rain. Evaporation is the process by which a liquid gradually changes into air in the form of vapor or gas. All liquids evaporate at different rates. Alcohol, ammonia and kerosene evaporate faster than water. There are two forces acting on the molecules that make up all substances. The first is the bond that holds them together. The other is the thermal movement of molecules, which causes them to fly apart. When these two forces are balanced, we have a liquid.

On the surface of a liquid, its molecules are in motion. These molecules, which move faster than the neighboring ones below, can fly into the air, overcoming the forces of cohesion. This is evaporation. When the liquid is heated, evaporation occurs faster. This happens because in a warm liquid the speed of movement of molecules is greater, more molecules have a chance to leave the liquid. There is no evaporation in a closed vessel.

This happens because the number of molecules in a pair reaches a certain level. Then the number of molecules leaving the liquid will be equal to the number of molecules returning to it. When this happens, we can say that the steam has reached its saturation point. When the air above the liquid moves, the rate of evaporation increases. The larger the surface of the evaporating liquid, the faster the evaporation. Water in a round pan will evaporate faster than in a tall pitcher.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Are Seaweeds Healthy?

Wherever there is sea water, seaweed can be found. They exist in a wide variety and belong to a large group of plants called algae - these are plants, but without leaves, stems, roots and flowers. But they also contain a green pigment called chlorophyll. Therefore, they can produce their own food. The reason these plants are not green in color is that chlorophyll is often taken up by other pigments, which is why some seaweeds are brown or red.

In the temperate zone, brown algae are most common. They grow in layers between the high and low tides, and have bubble floaters that children love to squash between their fingers. These plants are attached to stones with hook-shaped roots.

Another well known sea grass is kelp. It has different forms. In most cases, it is a long, flat, dense, blade-like grass that is attached to rocks with a stiff stem. Along the coast of the Atlantic Ocean, some of these algae reach 6 m in length, and the giant kelp of the Pacific Ocean is even longer. This brown alga belongs to the species that are used by humans, for example, to fertilize the soil, because they have a high concentration of potassium carbonate. They also serve as a source of iodine.

Another useful type of seaweed is Irish moss. It is quite rough and tough, like leather. It releases large amounts of agar-agar, a colorless jelly-like substance. In the East, tons of red seaweed are dried and eaten. They are not very nutritious, but contain a large amount of agar-agar. They are used as an additive in soups and to give density to other dishes.

Seaweed is also the main food source for ocean dwellers. The little sea creatures feed on them and in turn become food for the big ones. Seaweed releases oxygen and this helps keep the water clean. So, you see why seaweed is considered beneficial to humans.

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