Combustion and the Flame - Class 8 Science

Kerosene is a common liquid hydrocarbon fuel used for heating, lighting, and cooking in many households.

In a candle flame, the blue zone is the hottest part because it represents complete combustion, whereas the yellow and orange zones are cooler.

Soot is the black carbonaceous deposit formed by incomplete combustion of hydrocarbon fuels. It consists mainly of carbon particles that deposit on surfaces.

Rapid combustion is a type of combustion in which a substance burns rapidly and produces a large amount of heat and light in a short time.

LPG (Liquefied Petroleum Gas), petrol, and alcohol are all inflammable substances because they have low ignition temperatures and can easily catch fire. Inflammable means the same as flammable.

The ignition temperature is the minimum temperature at which a combustible substance catches fire.

A forest fire is an uncontrolled fire that occurs in a forest or woodland area. It is often triggered by extreme heat and dry conditions that ignite vegetation.

A flame is a phenomenon resulting from combustion, not a substance itself. A combustible substance is a material that can burn, such as wood or paper.

A fuel is any material that undergoes combustion to release energy. Combustible substances are classified as fuels.

Combustion is a chemical process where a substance reacts rapidly with oxygen (O2), releasing energy in the form of heat and light. The definition in the question has an error - combustion gives CO2 and water, not oxygen.