Differentiate between luminous and non-luminous flame.

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Solution

Luminous flame Non-luminous flame

This type of flame is observed when there is no sufficient oxygen. This type of flame is observed when there is sufficient oxygen.

Luminous flame will be yellow in colour and emits a lot of light. Non-luminous flame will be blue in colour and emits very little light.

Black soot and other residues are left behind. No residue is left behind.

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Luminous flame	Non-luminous flame
This type of flame is observed when there is no sufficient oxygen.	This type of flame is observed when there is sufficient oxygen.
Luminous flame will be yellow in colour and emits a lot of light.	Non-luminous flame will be blue in colour and emits very little light.
Black soot and other residues are left behind.	No residue is left behind.