What is fire?

Fire is a visible effect of the combustion process - a special chemical reaction. Occurs in the air between oxygen and specific fuel. Chemical reaction products are completely different from raw materials

The fuel must be heated to its ignition temperature for combustion. As long as there is enough heat, fuel and oxygen, the reaction will continue. Fire Triangle

Combustion refers to the reaction between fuel and oxygen to release heat. Depending on the amount of available oxygen, burning slows down or becomes faster. Flame burning is very fast, it is called burning. Combustion can occur only between gases

The fuel can be solid, liquid or gas. During chemical reactions that generate fire, the fuel is heated to the extent that gas is released from the surface (if not yet gas)

Only gas can burn. Gas is composed of molecules (atoms). When these gases are sufficiently hot, the molecules in the gas split and the molecular fragments recombine with oxygen in the air to form new product molecules - water molecules (H 2 0) and carbon dioxide molecules (CO 2) - and combustion If it is not completed, other products are formed

The heat generated by the reaction is the cause of continuous fire. The heat of the flame keeps the remaining fuel at the ignition temperature. The flame ignites the gas being emitted, and the fire spreads. As long as there is enough fuel and oxygen, the fire burns

In complete combustion, burning fuels produce only water and carbon dioxide (smokeless or other products). Flames are usually blue. To do this we need enough oxygen to fully integrate with the gas.

Many of us use methane gas (CH4) at home. This is also called natural gas, it is used for cooking. If the gas is heated (by flame or spark) and there is sufficient oxygen in the atmosphere, the molecule will split and completely reform the water and carbon dioxide.

If the available oxygen is insufficient during the chemical reaction, incomplete combustion will occur, producing products such as carbon (C) and carbon monoxide (CO) and water and carbon dioxide. Less heat generation during incomplete combustion at complete combustion

Although we are all familiar with the fire, most of us are struggling to explain exactly what fire is. When I saw a burning candle, a fireplace firewood, or an active gas stove, we saw a hot flame, and we felt a fever. You can see the mountain fires and the building burning on TV and the Internet. Because of these experiences, fire is familiar, and we understand its behavior well. But what is fire? You can say that the nature of fire has been a problem for thousands of years. ; -) Since fire has been known since civilization began, exploration of fire is as old as civilization itself. Some ancient civilizations believed that fire was one of the basic elements - in other words, the basic entity that could not be broken down into components. The ancient Greeks believed that the four basic elements were the earth, water, air, and fire.

The ancient Greeks believed that fire is one of the four basic elements that make up the whole of the universe. In almost all myths of culture, fire is a sacred substance that gives life and strength. In fact, fire is not a substance. When you look at the flying jumping flame, you observe the process rather than observing things - a chemical reaction. When the cut apples on the counter change to brown, the same chemical reaction occurs when silver loses its gloss or when the nail rusts.

Because of the presence of three elements (fuel, oxygen, heat), the fire burns - often called a fire triangle. When the fourth element is added, sometimes it is called a tetrahedron of fire: chemical chain reaction can help maintain some kind of fire. The purpose of fire fighting is to deprive at least one of the elements of a fire. The most common way is to extinguish with water. However, depending on the fire, other methods such as bubbles may be necessary. Firefighters have various equipment for this purpose: ladders, pump trucks, tank lorries, fire hoses, fire extinguishers.