In ancient times, people did not know for sure where and why dew appears in the evening after a hot day. It was even given divine significance. In principle, this trend affected all events that a person could not explain.
The properties of dew in the beliefs of the Slavs. Healing Possibilities
Surprisingly, there were many beliefs associated with the incredible benefits of this very dew. Many said that it is very useful to walk barefoot in the morning on the grass covered with this moisture. Moreover, in the morning they took out the sick and laid them on cold dew.
To use the healing properties of dew in the treatment of diseases, it was collected in a jar and taken on an empty stomach. Surprisingly, many diseases went nowhere, they simply disappeared: vision was restored, wounds healed faster. It was believed that she possesses the energy of the earth, maternal energy. Thoughts about why dew appears on the grass were uninteresting; this phenomenon was explained by the divineintervention. More interested in its healing properties. Probably, even now in villages or small settlements you will hear that swollen feet recover very quickly in the morning if you walk barefoot on the grass.
Scientific explanation of the occurrence of dew
But the era of science has come, and this phenomenon has been clearly and simply explained - figured out where the dew comes from and why it happens.
The definition of the phenomenon is as follows: these are some small drops of condensed moisture that settle on plants or soil during the onset of coolness in the morning or evening. What does it take for dew to form? It is necessary that there be a warm day, after sunset there were no clouds and the sky was clear, as well as favorable terrain - a surface that can easily give off heat.
Dew point - some physics from school years
This concept in physics is also associated with such a concept as the dew point. Who remembers from the school course, the dew point temperature is the value of the gas temperature at which the water vapor contained in this gas is cooled isobarically and becomes saturated above a flat water surface.
In other words, this is the value to which the air temperature should drop. Then the formation of condensate from moisture will begin. Temperature and humidity readings are very important. The higher the humidity, the higher the dew point temperature. Less humidity will make it harder to reach the dew point.
Tearsangels or plain water?
The question of why dew appears in the evening after a hot day already contains half the answer. What was given such a high, spiritual, divine significance turned out to be an elementary condensate.
This is water that condenses on the surface of the grass as the earth releases heat energy into space at night. Naturally, not all water that appears on the surface of green plants in the morning in the summer is dew. Other atmospheric phenomena associated with moisture, such as rain (if we talk about the warm seasons), can leave their wet footprints on the ground. The difference is that rain condenses in the high layers of the atmosphere when the dew forms directly above the earth's surface.
Hot weather is one of the first important conditions for dew formation
Moisture in the air is always present, in one way or another. And the higher the humidity, the more likely the appearance of morning dew and its abundance is also higher. As stated earlier and as noted in the question of why dew appears in the evening after a hot day. It's a "hot day". Is this condition important?
Definitely. Temperature difference plays an important role. Sharp thermal radiation in the evening, when the sun sets, begins to occur in an active way. That is, at the same time, the heat that was received during the day from the sun's rays begins to intensively leave the earth. The fastest way to do this is tograssy glades, and therefore the grass in the fields is most often covered with dew.
How to use dew to determine the weather?
But nevertheless, despite the simple explanation from the point of view of science, people still competently used this phenomenon without the intervention of scientists.
For example, the way dew appears was a kind of hydrometeorological center by which people could predict the weather for the next day. The condensate that falls late in the evening disappears before the sun sets, at dawn; this indicates that the day will be sunny, clear. At the same time, we can say with absolute certainty that there will be no precipitation on such a day. Interestingly, there are different types of dew, but it is the one that falls in our latitudes that can give such a definition of weather.
Dew in the cold season
With why dew appears in the evening after a hot day, everything seems to be clear. But the funny thing is that the same process creates two unique and beautiful phenomena in nature. In the warm season, he gives us dew, and in the cold season, he covers everything with frost.
To create this miracle, you also need your own conditions, but, in principle, the process is similar to how dew appears on grass. The difference lies in the fact that this condensate is susceptible to low temperatures, which is why it appears before the human eye already in an icy form. Its appearance is not as simple as it seems at first glance, but this is already a topic forcompletely different conversation.
