Combustion of flame class 8 | worksheet

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Combustion of flame class 8 | worksheet 

´╗┐Combustion of flame class 8. Download Combustion of flame class 8 worksheet based on the latest CBSE syllabus including MCQ question, define, word problem and long questions.

Combustion of flame

Calorific value is the amount of heat liberated when one gram of fuel burns completely in oxygen.

Combustible substances are those substances that can catch fire easily. Example petrol

Combustion is a chemical reaction in which a substance is burnt with the help of oxygen present in the air to produce heat and light.

A flame is a region where the combustion of fuel takes place.

Ignition temperature is the minimum temperature at which a substance catches fire,

Inflammable substances are certain substances that catch fire easily and burn, have low ignite temperature, Example alcohol, petrol, synthetic fibres.

A fire extinguisher is a portable apparatus that is used to put out an accidental fire.

Fuel is a substance that can burn in the presence of air to produce heat in a controlled manner. Heat are classified into two groups.

Primary fuels and secondary fuels.

Heat can also be classified based on its physical states as solid, liquid, and gaseous fuels.

A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is said to be combustible. It is also called a fuel. The fuel may be solid, liquid orgas. Sometimes, light is also given off during combustion, either as a flame or as a glow.

We find that the gas burns rapidly and produces heat and light. Such combustion is known as rapid combustion. There are substances like phosphorus which burn in air at room temperature. The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called spontaneous combustion.

The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).

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