Where does ice disappear from wet laundry frozen in the cold? Detailed answer

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Where does ice disappear from wet laundry frozen in the cold? Detailed answer

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Where does ice disappear from wet laundry frozen in the cold?

Wet laundry hung out in the cold freezes in a few minutes and becomes rigid like a sheet of cardboard or plywood. However, after two or three days it is already completely free of ice - soft, elastic and almost dry. The ice passed from the solid crystalline phase directly into steam, bypassing melting.

This "dry" evaporation is called sublimation, or sublimation. Sublimation of ice is possible at almost any negative temperature, but under one condition: the humidity of the air must be sufficiently low.

Sublimation occurs with the absorption of heat, and for some substances the heat of sublimation is very high. This is the reason for the use of sublimation to protect the warheads of intercontinental missiles and spacecraft returning to Earth from aerodynamic heating in dense layers of the atmosphere.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

Why does corn have a silk strand?

The silk strand that the corn plant produces is needed to produce seeds. Here's how it goes. The corn plant has a hard stem 2 to 6 meters tall. A brush appears at the top of it. These are male flowers. Below, one or more shoots are formed - the ovary of future cobs. Each of these formations releases a strand of silky threads. These are female flowers.

Each thread grows from an embryo called an ovule. They are arranged in rows along the future cob. Each of them will produce a seed, which is called a grain, if a silk thread is fertilized with pollen from a male flower. To catch this pollen, delicate silky threads protrude from the leaves wrapping the cob.

When it comes to flowering, the tassels of male flowers produce yellowish fine pollen. A light summer wind shakes the pollen-covered tuft of an ear, and the pollen scatters. The wind carries it around, and it falls on silky threads located lower along the stem. Tiny stigmas at the ends of silky threads catch dust particles. The pollen passes through the silk threads to the ovules and fertilizes them. The ovary grows into a large cob, and the ovules turn into grains.

Growing grains consist of a soft yellow shell filled with a "milky" liquid. When corn ripens, they become hard and contain starch.

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artificial wood 23.05.2020

A new material developed by the University of Science and Technology of China, which is light in weight, as strong as wood, but does not have the standard weak characteristics of wood, does not burn or absorb water.

To create synthetic wood, we took a solution of polymer resin and added a little (a pinch) of chitosan powder, a basic cationic polysaccharide polymer obtained from crab and shrimp shells. They sublimated the solution, resulting in a structure filled with tiny pores and channels, backed by chitosan. They then heated the resin to a temperature of 200 degrees Celsius (to vulcanize the latter), thus creating strong chemical bonds.

Unlike real trees, the new material does not take years to grow. In addition, the new material practically does not absorb water; specimens immersed in water and a strong acid bath remained there for 30 days with little or no loss of quality, while specimens of Balsa wood tested under the same conditions lost two-thirds of their strength and 40 percent of their resistance to turmoil. The new material was practically incombustible and stopped burning as soon as it was removed from the flame.

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Environmentally friendly alternatives to polymer resins could also increase interest in the new material.

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