What is fire? Detailed answer

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

What is fire? Detailed answer

Big encyclopedia for children and adults

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

Did you know?

What is fire?

The scientific term for incineration is "burning". There are many types of combustion, but in most cases everything is very simple. The oxygen in the air must come into contact with some material that can burn.

As a result, heat is released. If the process is fast, we observe flames or smoldering, or simply feel that such a reaction is taking place - for example, in an explosion. When wood or paper reacts with oxygen, we observe fire. But similar combustion occurs in a car engine. Gasoline burns when it comes into contact with oxygen from the surrounding air.

In an automobile engine, combustion occurs so quickly that we call this process an explosion. Conversely, there is combustion that proceeds so slowly that we do not notice it for years. For example, when metal rusts, we are dealing with a combustion process!

With slow burning, if the heat generated does not enter the air, the temperature can reach a level where ignition starts. This is called "spontaneous ignition". Spontaneous combustion can start in a pile of oily rags left indoors. The oil will slowly oxidize, which will generate heat. If there is no outlet for it, it will accumulate. Gradually it will be enough to catch fire rags.

The oxygen required for combustion is widely distributed in nature. The air around us contains approximately 21% oxygen. Oxygen is always ready to start the combustion process.

However, in order for this process to start, in addition to oxygen, the presence of "combustible" materials is necessary. Combustible materials that are specifically used for combustion are called "fuels". For example, wood, coal, coke, kerosene, some gases are fuel or combustible.

During combustion, two oxygen atoms from the surrounding air combine with one carbon atom of the fuel, resulting in carbon dioxide. Did you know that the combustion process in our body, necessary for the production of heat and energy, also releases carbon dioxide, which we exhale?

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why do we stop growing?

The average newborn has a length of about 50 cm. In the first 20 years, a person's height triples and reaches an average of about 1,7 meters.

But why does a person not continue to grow all his life? What stops the growth of the body? The body has a system of glands called endocrine glands that control our growth. The endocrine glands include: the thyroid gland in the neck, the pituitary gland connected to the brain, the thymus gland, which is located in the chest, and the gonads. The pituitary gland is one of the glands that stimulates the growth of our bones. If he works too hard, the arms and legs grow too long, and the hands and feet also become too big. If this gland does not work hard enough, we can remain midgets.

A child is born with a large thymus gland. During childhood, it continues to increase, and at the age of 13 or 14 it begins to shrink. The thymus definitely has a connection with the gonads. It works while the gonads are small. As soon as they begin to develop, the thymus gland stops working. That's why, when a person fully matures sexually (at about the age of 22), he practically stops growing!

Sometimes the sex glands develop too quickly and prematurely slow down the growth of the thymus. As a result, a person's height remains below average. Since, compared to other organs, our legs begin to grow later and must reach a large size, this early development leaves them short. Therefore, people who develop too rapidly sexually are often stocky. An example of this type of people is Napoleon.

If the sex glands begin to develop too late, the thymus gland continues to work, and the growth of a person becomes above average. In fact, we continue to grow a little even after 25 years and reach our maximum height around the age of 35-40 years. After that, we decrease by about 12 mm every 10 years. The reason for this is the dehydration of the cartilage in our joints and spine as we age.

Test your knowledge! Did you know...

▪ What are we eating for?

▪ What disease do British doctors have to deal with most often?

▪ What is the difference between a catapult and a ballista?

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:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

WDM system with maximum spectrum efficiency 02.06.2012

Huawei has unveiled a prototype WDM system, which is an upgraded version of 50GHz fixed-spaced commercial equipment. According to the company, the prototype WDM system has the highest spectrum efficiency among existing WDM solutions. It supports various channel spacing with a minimum spacing of 12,5GHz, which not only improves the spectrum efficiency and flexibility of the WDM system, but also lays the foundation for multi-carrier and next-generation optical networks with speeds above 100G and adjustable bandwidth. . This highly efficient spectrum technology will enable operators to build WDM networks that meet the needs of subscribers in the future.

The popularity of broadband services has led to a rapid increase in transmission capacity and accelerated the transition to 100G systems. Providers are now targeting technologies above 100G WDM with multi-carrier support, also known as 400G and 1T transmission solutions. All current WDM systems have 50 or 25 GHz channel spacing, such spectrum efficiency is not sufficient for 400G or 1T multi-carrier transmission networks. Huawei's new WDM prototype improves spectrum efficiency in large capacity WDM systems. This compact solution will provide denser placement of high-speed carrier channels and more complete use of the optical fiber's spectral resource.

WDM prototype supports 40G, 100G, 400G and 1T simultaneous transmission. In addition, it is compatible with legacy systems with 50 or 25 GHz channel spacing. In practice, this means a smooth upgrade from 40G and 100G systems to 400G and 1T systems with effective investment protection for existing networks.

Spectrum Efficiency Technology is one of the core technologies of next-generation optical networks with adjustable bandwidth. The signals of such networks provide automatic adjustment of the modulation mode and transmission rate depending on the length of the line and service capacity, as well as a constant change in the range of the spectrum used. The 12,5 GHz step provides more flexible bandwidth, transmission distance and frequency range, which frees up frequency resources for data transmission.

Jack Wang, president of Huawei's transport network equipment division, said, "The creation of the world's first 10 petabit optical switch prototype and 400G DWDM prototype allowed users to take a look at next-generation optical networks with a high spectral efficiency WDM system prototype. Huawei is focused on creating innovative optical network solutions, which makes a significant contribution to the development of next-generation broadband networks and optical data transmission technologies."

Other interesting news:

▪ Smartphone Microsoft Lumia 430

▪ New series of ultra-bright white LEDs HLMP

▪ Treatment of herpes with infrared light

▪ Muscles are grown that react to light of a certain wavelength

▪ Smart optocoupler with gate driver

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Power supplies. Article selection

▪ article Moons of Jupiter. History and essence of scientific discovery

▪ article Who managed to cross the Atlantic Ocean on foot and tried to cross the Pacific? Detailed answer

▪ Ax article. Travel Tips

▪ article Method for measuring the saturation current of the core of an inductor, transformer or inductor. Encyclopedia of radio electronics and electrical engineering

▪ article Electrical installations in hazardous areas. Selection of electrical equipment for hazardous areas. General requirements. 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