Why does water remain on the skin of a person who has come out of it, and does not roll down? Detailed answer

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Why does water remain on the skin of a person who has come out of it, and does not roll down? Detailed answer

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Why does water remain on the skin of a person who has come out of it, and does not roll down?

Water remains on the skin of a person who has left it, and does not roll down, as, for example, from the fat-covered plumage of waterfowl, only because human skin is wetted with water: water molecules are attracted by the forces of intermolecular interaction to the skin stronger than to each other.

The cotton fabric of the towel is even more wetted with water - water molecules are attracted to the fabric of the towel more strongly than to the skin, and when wiped, they pass from the skin to the towel. Otherwise, the towel would simply smear the water over the skin without absorbing it (which is exactly what would happen if the towel was made of synthetic fabric that repels water).

Wetting - a surface phenomenon that occurs when a liquid comes into contact with a solid body - also manifests itself in the spreading of a liquid over a solid surface. It plays an important role in the impregnation and drying of porous materials, washing action, metal soldering, gluing, fluid flow under weightless conditions.

Author: Kondrashov A.P.

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In 2005, in the UK, a public opinion poll on the greatest technical invention since 1800 named the bicycle as the winner. Not only did it outperform inventions like the internet and the internal combustion engine, it also won more votes than all other inventions combined.

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The longest-lived vertebrate identified 17.08.2016

Marine biologist Julius Nielsen from the University of Copenhagen (Denmark) and his colleagues analyzed the age of Greenland sharks (Somniosus microcephalus). They found that these animals live up to 400 years on average, making them the longest-lived vertebrates on Earth.

The Greenland shark is widely distributed throughout the North Atlantic. Adults of this fish reach 400-500 cm in length. The biology of the species has not yet been sufficiently studied, however, it is known that these sharks grow at a rate of only about 1 cm per year. This fact suggested to scientists that Greenland sharks can live an unusually long time.

Traditional methods for determining the age of fish involve the analysis of calcium-containing tissues. They are very rare in the body of Greenland sharks, so for analysis, ichthyologists used radiocarbon analysis of the lens of the eyes of caught fish. In total, scientists studied 28 female Greenland sharks.

The analysis showed that the average age of the shark is about 272 years. The body length of the oldest sharks in the sample was 493 and 502 cm, and the age was 335 and 392 years, respectively.

A number of previous studies have shown that females of this species reach sexual maturity at a body length of 400 cm, which corresponds to an age of at least 156 years, the authors say. According to the results of this study, the Greenland shark is currently the longest-lived among terrestrial vertebrates.

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