Question

can any on tell me the important points of

combustion and flame

please please my paper will start in 20 min ​

Answer 1

Answer:

Combustion: The process of burning a substance in the presence of air (oxygen) and undergoes a chemical reaction to produce heat and light.

• The substances which burn in air are called combustible.
• Oxygen (in air) is essential for combustion.
• During the process of combustion, heat and light are given out.
• Ignition temperature is the lowest temperature at which a combustible substance catches fire.

Types of combustion: The type of combustion differs depending on the type of fuel. Based on nature and intensity combustions are classified into three types. They are:

(i) Rapid combustion

(ii) Spontaneous combustion

(iii) Explosion

Flame: It is a zone or burning vapour. The substances which vaporise during burning give flames. Example: Kerosene oil and molten wax.

• Inflammable substances have very low ignition temperature.
• Fire can be controlled by removing one or more requirements essential for producing fire.
• Water is commonly used to control fires.
• Water cannot be used to control fires involving electrical equipments or oils.

There are three different zones of a flame – dark zone, luminous zone, and non-luminous zone.

Fuel is any material that is burned to obtain energy that can be used to heat or move another object.

A good fuel must:

• Be readily available.

• Be cheap.

• Burn easily at a moderate rate.

• Produce a large amount of heat.

• Not leave behind any undesirable substances.

Fuels differ in their efficiency and cost.

Fuel efficiency is expressed in terms of its calorific value which is expressed in units of kilo joule per kg.

Explanation:

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