Emerald Robinson: Hi! I am Emerald Robinson and in this. What is video? We'll answer the question what is fire?
Fire is scientifically defined as chemical reaction that resolves in heat, light, and smoke. We call this type of chemical reaction Oxidative Combustion that is the reaction requires oxygen and actively burns fuel.
Fire is also an Exothermic Reaction because it gives off heat. When we think of fire we picture of flame, a massive burning ionize gas or vapor. If the flame is hot enough it may ionize the gas into the state of matter none as plasma. Pyrologists, scientist who study fire have defined four conditions required for a fire to burn.
1: Their must be fuel.
2: Their must be oxygen.
3: Their must be an initial source of heat to ignite the fire and.
4: Their must be conditions for a chain reaction. Events that occur when a reaction's products automatically starts the reaction all over again.
In fire the key product is heat, which turns more fuel to vapor, enabling it to burn, which then produces more heat and so on. A fire's live cycle has four phases Ignition, when fuel, oxygen, and a source of heat combine and start the chemical reaction.
Growth, which happens when the fires flames begin a chain reaction igniting more fuel. Full Development, when most of the fuel is being consumed. And Decay, which happens when the fuel is mostly consumed, the fires heat is decreasing, and the fire is burning out.
A fire is put out or extinguish when more and more of the components is removed. For example, fire extinguishers remove the source of the oxygen by replacing it with carbon dioxide. While dumping water on the campfire removes its heat.
Fire can be destructive, but it's been used by humans for almost a million years to cook our food, provide light, and keep us warm.