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Physics CBSE Live product
Class 7 (2026-27)
Changes around us: Physical and Chemical
Rusting and Combustion
6.
Fire triangle
Question:
4
m.
Briefly answer the following:
Name the three requirements needed for combustion.
For the process of combustion to occur, three important requirements are needed:
1.
A
combustible substance
non-combustible substance
insulator
Transparent substance
(also called
fuel
)
2.
Oxygen
Nitrogen
Neon
Helium
3.
Moisture
Sound
Heat
Cold
that helps the fuel reach its
freezing point
ignition temperature
boiling point
dew point
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