Students can go through AP State Board 8th Class Physical Science Notes Chapter 8 Combustion, Fuels and Flame to understand and remember the concept easily.
AP State Board Syllabus 8th Class Physical Science Notes Chapter 8 Combustion, Fuels and Flame
→ Burning material in the presence of air (oxygen) is called combustion
→ The substances which burn in the air are called combustible
→ Oxygen or air is needed for combustion to take place
→ During the process of combustion, heat and light are given out.
→ The lowest temperature at which a substance catches fire is called its ignition temperature.
→ Inflammable substances have very low ignition temperature,
→ The type of combustion in which material suddenly burns into flames without the application of any apparent cause is called spontaneous combustion
→ The type of combustion in which material burns rapidly and produces heat and light is called rapid combustion.
→ The amount of heat energy produced on complete combustion of 1 kg of fuel is called the calorific value of that fuel.
→ In the blue zone of the candle flame vaporized wax burns completely due to a good supply of oxygen.
→ Combustion: Burning o material in the presence of air (oxygen) is called combustion.
→ Combustible and Non – combustible materials: The materials which burn when brought near a flame ore are called combustible materials. The materials which do not burn are called non-combustible materials.
→ Ignition temperature: The lowest temperature at which a substance catches fire is called ignition temperature.
→ Inflammable material: The material which has a very low ignition temperature easily catches fire called an inflammable material.
→ Spontaneous combustion: The type of combustion in which material suddenly burns into flames without application of any apparent cause is called spontaneous combustion.
→ Rapid combustion: The type of combustion in which material burns rapidly and produces heat and light is called rapid combustion.
→ Explosion: The reaction ¡n which there is the liberation of heat, light, sound, and a large amount of gas is called an explosion.
→ Fuels: The materials which burn when brought near a flame producing heat and light are called fuels.
→ Calorific value: The amount of heat energy produced on complete combustion of 1 kg of fuel is called the calorific value of that fuel.
→ Joseph Priestly (1733 – 1804):
- Joseph Priestly was an English philosopher and chemist
- He was the first person to prepare artificially by heating mercuric oxide.
- He also prepared carbon dioxide and nitrous oxide in the laboratory.