Volcano on the table. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Volcano on the table. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Ammonium dichromate ground in a mortar is poured onto a small square sheet of iron or tin and set on fire with a match. Burning ammonium throws out a large number of sparks, it is reminiscent of a volcanic eruption. The "volcano" itself is constantly growing.

This is due to the fact that during combustion, ammonium decomposes and a new green substance is formed - chromium oxide.

Author: Shkurko D.I.

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The hearts of the singing choristers are in sync 24.07.2013

Singers who sing in a choir synchronize their heartbeats, and as a result, their pulse speeds up and slows down at the same time, according to a study by scientists from the Salgren Academy at the University of Gothenburg (Sweden). Now scientists have precisely defined what it means to "sing in unison."

The purpose of the study by Swedish scientists is to study the effect of music on our body and health and to find new forms of using music for medical purposes, primarily within the framework of rehabilitation and preventive care. In this part of the study, scientists have already proven that music affects the heart rate of each chorister.

The experiment involved 15 students from a school in Gothenburg. They were asked to perform three choral exercises: monotonous humming, playing a well-known Christmas carol and chanting mantras. In each case, the researchers recorded the heart rhythms of all the participants in the choir. The results of the study showed that music has a direct effect on the heartbeat of each chorister, and at the same time, the pulse of all singers is synchronized during singing - it speeds up and slows down at the same time.

According to scientists, people who sing regulate the activity of the vagus nerve, which is involved in our emotional life, affects communication with other people, as well as the timbre of our voice. As it turned out, songs with long phrases have the same effect as yoga breathing exercises. Researchers suggest that through singing we can control our mental state.

The impact of choral singing on health has only just begun to be studied, but a positive effect is already noticeable. According to scientists, the benefit of choral singing is that it calms our breathing, normalizes the heart rate, and this, in turn, has a positive effect on health.

In the case of controlled breathing, the pulse rate and heart rate decrease on exhalation and then increase on inspiration. Exhalation activates the vagus nerve, which lowers the heart rate and slows the pulse. The fluctuation in heart rate between inhalation and exhalation is called sinus respiratory arrhythmia. This is a type of physiological arrhythmia that is best expressed in young healthy people who are not subject to stress. And, according to scientists, the song helps to control breathing: during the chanting of phrases, exhalation occurs, and in the pauses - inhalation.

Choral singing helps develop the skill of controlled breathing. In addition, the pulse and heartbeat of the choristers are synchronized during the performance

Now the researchers intend to understand how the synchronization of the heart rate during choral singing will create a favorable psychological atmosphere for strengthening the ability to cooperate and communicate people.

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