The type of combustion reaction that occurs with the evolution of tremendous amount of heat, light, gases and sound is known as Explosion. For instance, when we burn a cracker it bursts with the liberation of tremendous amount of heat, light, gases and sound.
What is explosive combustion give one example class 8?
The fireworks which we explode during festivals work on the explosive combustion of substances. when a cracker is ignited with a burning matchstick, the chemicals present in it undergoes a sudden combustion producing heat, light and a large volume of gases.
What is explosion Class 8 in Short answer?
Explosion – When a sudden reaction takes place with the release of heat and light and evolution of a large amount of gas takes place it is called an explosion.
What is combustion and flame class 8?
According to the chapter of Class 8 Combustion and Flame, when a substance reacts with oxygen, it produces heat , which is referred to as combustion. A combustible substance is any material that may burn or undergo combustion. A combustible substance is also known as fuel.
What is explosive combustion?
Explosive Combustion happens when the reaction occurs very rapidly . The reaction occurs when something ignites to produce heat, light and sound energy, The simple way to describe is it to call it an explosion. Some classic examples are firecrackers or blowing up of dynamite.
What are combustibles Class 8?
Those substances which can burn are called combustible substances. For Ex:Cloth,straw, cooking gas, kerosene oil, wood, coal,charcoal etc.
What is a fuel class 8?
A material which is burnt to produce heat is called a fuel. For Ex:Wood,coal,LPG,Kerosene,petrol,diesel,natural gas,biogas. ... The heat energy produced by burning a fuel can be used directly to cook food,for running motor vehicles and factory machines,can be converted into electrical energy at thermal power stations.
What are the two types of combustion?
2 Types of Fire. Combustion is applicable to two types of fire: Flaming combustion and smoldering combustion [13].
How can you control fire?
The most common method to control a Class-A fire is to remove heat by spraying the burning solid fuels with water . Another control method would be to reduce the oxygen content in the immediate vicinity of the fire (i.e., “smother” the fire), such as by the introduction of an inert gas such as carbon dioxide.
What is the ignition temperature of phosphorus Class 8?
Ignition temperature: It is the minimum temperature to which a combustible substance must be heated, before it catches fire. Therefore, we see that a combustible substance cannot catch fire as long as its temperature is lower than its ignition temperature e.g. Ignition temperature of phosphorus is 35 °C.
Which fuel has the highest calorific value?
Calorific value is nothing but the energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. Hence, hydrogen has the highest calorific value.
What is an ideal fuel?
The ideal fuel, inexpensive and is readily available . They easily burn at a moderate rate in the air and release a great amount of energy. Ideal fuels do not leave behind undesirable chemicals that could be detrimental to atmosphere and do not adversely impact the environment. Examples: LPG, natural gas, CNG.
What are the 4 products of combustion?
- Carbon Dioxide.
- Carbon Monoxide.
- Sulfur Dioxide.
- Nitrogen Oxides.
- Lead.
- Particulate Matter.
Is combustion an explosion?
The transition from combustion to explosion is caused by an acceleration of the reaction , induced either by a rise in temperature or by increasing lengths of the reaction chain. The first is called thermal explosion, and the second is called chain explosion.
What 3 things do all explosions need?
Explosives must contain a fuel and an oxidizer , which provides the oxygen needed to sustain the reaction. A common example is ANFo, a mixture of ammonium nitrate, which acts as the oxidizer, and fuel oil (the fuel source).
What is flame short answer?
Answer: Flame is a region where the burning or combustion of gaseous substances take place . ... Those substances which provide energy on burning are called ‘fuels’; e.g., coal, petroleum, LPG, etc. Question 14. Give two examples each of solid fuels, liquid fuels and gaseous fuels.
