Combustion and Flame

​combustion

The burning of any sustance in the presence of oxygen is known as combustion. ​combustion is mostly of 2 types the 3rd type is known as explosion. there are many useful reasons to apply combustion in our daily life, but there are some of the disadvantages too.

​Due to chemical, biological, or physical processes, combustible materials self-heat to a temperature high enough for ignition to occur.

​​Spontaneos combustion

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​Rapid combustion is a process in which large amount of heat and light are released in a very short span of time.

​​Rapid combustion

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​uses of combustion

Some text here about the topic of discussion

#Coal

#Petrol

#Wood

#​Charcoal

#Kerosene ​

​Burning of fuels

*The substance that undergoes combustion is said to be combustible, it is condidered as a fuel.​

​Cow dung cake- 6000-8000

Wood-17000-22000

Coal-25000-33000

Kerosene- 45000

Petrol-45000

Diesel-45000

Methane-50000

CNG-​50000

Biogas-35000-40000

Hydrgen-150000

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​fuel- Calorific value. kJ/kg

Multiple Choice

The hottest zone of a candle flame is

• Non-luminous zone

• Luminous zone

• dark zone

• blue zone at the base of the wick.

Multiple Choice

Which poisonous gas is formed as a result of incomplete combustion?

• Coal gas

• carbon monoxide

• carbon dioxide

• nitrogen oxide

Multiple Choice

Good fuels have

• low ignition temperature and high calorific value

• high ignition temperature and high calorific value

• low ignition temperature and low calorific value

• high ignition temperature and low calorific value

Open Ended

How does Carbon dioxide extinguish fire?