What is dew? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

What is dew? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

What is dew?

You may think that dew is a simple phenomenon of nature, easily explained. Oddly enough, for a long time they could not understand what dew is. Many books have been written on this subject.

From the time of Aristotle until the XNUMXth century, it was believed that dew "falls" just like rain. But the dew does not "fall out" at all. The well-known dew that we see on the leaves of plants is not dew at all! You see how wrong we were about dew.

In order to understand what dew is, we must know something about the air that surrounds us. The air contains a certain amount of moisture. Warm air contains more moisture than cold air. When air comes into contact with a cold surface, some of it condenses and the moisture it contains remains on that surface. This is dew.

The temperature of such a cool surface must be below a certain value at which dew forms. This value is called the "dew point". For example, if you pour water into a glass or a metal vessel, this does not mean that dew forms on their surface. If you add ice there, then dew does not form immediately, but only after the surface of the vessels has cooled to a certain temperature.

How is dew formed in nature? This requires warm moist air, which must come into contact with a cold surface. Dew does not form on the ground or paths, as they retain the heat of the sun for a long time. And on grass or plants that have cooled down, dew forms.

Then why did we say that drops on plants are not dew? Because only a small part of the moisture that we observe on plants in the morning is dew. Most of the moisture (and sometimes all the moisture) is produced by the plant itself. Moisture comes out of the plants through the pores of the leaves. This is a continuation of the process of irrigating the plants to provide the leaves with water from the ground. This process begins during the day to protect the leaf surface from the heat of the sun, and continues at night.

In some parts of the world, so much dew falls that it is collected in special tanks for watering livestock!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Who and when had sex on the lunar soil?

In 2002, NASA astrophysicist Thad Roberts, along with his girlfriend and two other accomplices, stole a safe containing lunar soil and rocks from all of the Apollo missions. After the robbery, the young people settled in a hotel, where Ted and his lover laid stones on the bed and had sex right on them. When they tried to sell the stones online to a collector, he contacted the FBI, and the kidnappers were eventually arrested and convicted.

Test your knowledge! Did you know...

▪ How does the house numbering system in St. Petersburg differ from the generally accepted one in other cities of Russia?

▪ Where did church choir members survive by being late to class?

▪ What scream can be heard in over 200 movies and computer games?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

quantum stopwatch 06.11.2022

Scientists at Uppsala University in Sweden have developed a new way of measuring time that doesn't require a specific starting point. This method is based on an experiment with Rydberg atoms - particles of hydrogen and alkali metals with electrons in a highly excited state.

This state is achieved by exposing the substance to a laser beam, after which the electrons are greatly removed from the nucleus and the size of the atom increases significantly. It is the change in the position of the electron that can be used for the most accurate measurement of time. Therefore, scientists used the transfer of atoms to the Rydberg mill as a new "time scale".

Experts measured the results of excitation of helium atoms by a laser, comparing the obtained data according to theoretical indications.

"If you use a counter, you have to define zero, and only from that moment you start counting. The advantage of our method is that you do not need to start the clock - you just look at the interference structure and say: "Ok, 4 nanoseconds have passed" , said the study's lead author, physicist Marta Berholz from the University of Uppsala in Sweden, who led the team.

In particular, the researchers were able to accurately determine the time span of 1,7 trillionths of a second.

As part of future experiments, they plan to replace helium with other atoms, as well as use laser pulses of different energies, which should expand the range of measured time intervals.

Other interesting news:

▪ Ultra compact LED

▪ Acer Halo Swing smart speaker

▪ Women remember words better than men

▪ Cooling electronics with jumping droplets

▪ Alternative to silicon for microcircuits

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site History of technology, technology, objects around us. Article selection

▪ DNA article. History and essence of scientific discovery

▪ article Which country is the largest in South America? Detailed answer

▪ article Dispatcher. Job description

▪ article Manganese drying oils. Simple recipes and tips

▪ article Regenerative mode in a super-regenerative receiver. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews