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the process of burning something is called combustion. there are three types of combustion rapid ,spontaneous and explosive.
Answer:
1) The process of burning is known as combustion .
2) Combustion has three types-
A.rapid
e.g. Burning of wax in a candle
B.spontaneous
e.g. Burning of white phosphorus on its own at room temperature
C. explosive
e.g. Burning of fire crackers
3) a.Combustible substances
- Substances that catch fire easily and burn easily are called combustible substances
- e.g. Paper, Clothes, Wood, LPG
Non- combustible substances
- Substances that do not catch fire easily and do not burn are called non - combustible substances
- e.g. Wood
b. Exhaustible Resources
- Those resources which gets depleted after the continuous use of humans.
- Take millions of years to renew again
- Fossil Fuels like coal, petroleum etc.
In -Exhaustible Resources
- Resources which cannot get depleted even after continuous use of humans
- e.g. Tidal energy, biogas etc.
4) The visible gaseous part of a fire is known as flame and it is caused by highly exothermic reaction taking place in a thin zone
5) There are three regions of a flame-
A. Innermost zone
Zone which is formed just around wick of candle flame as candle burns. It is the dark zone of flame and least hot .
B. Middle zone
Zone which is moderately hot with limited oxygen supply. It is the luminous zone and major part of the flame .
C. Outermost zone
Zone of complete combustion. It is non - luminous and hottest zone .