AP Board 8th Class Physical Science Notes Chapter 8 Combustion, Fuels and Flame

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.

AP Board Solutions AP Board 8th Class Physical Science Notes Chapter 8 Combustion, Fuels and Flame

→ 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.

AP Board Solutions AP Board 8th Class Physical Science Notes Chapter 8 Combustion, Fuels and Flame

→ Calorific value: The amount of heat energy produced on complete combustion of 1 kg of fuel is called the calorific value of that fuel.
AP Board 8th Class Physical Science Notes Chapter 8 Combustion, Fuels and Flame 1
→ 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.