Anu wants to boil water quickly in a test tube.

Question:

Anu wants to boil water quickly in a test tube. On observing the j different zones of the flame, she is not able to decide which zone of the

flame will be best for boiling water quickly. Help her in this activity.

Solution:

Anu should keep her test tube in the outermost zone or non-luminous zone of the flame because it is the hottest zone of a flame and has more

temperature.

In the outer zone of a flame, complete combustion of the fuel takes place because there is plenty of air around it so, water in a test tube will boil

quickly in this zone.

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