Question

Anu wants to boil water quickly in a test tube. On observing the 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.

Answer 1

Flame and its zones

• A flame may be divided into three zones.
• Since there is plenty of air around a flame in the outer zone, full fuel combustion occurs, and water in a test tube boils fast in this zone.
• The outer zone is blue due to full combustion.
• When compared to the other zones, this one has the highest temperature.
• The non-luminous section of the flame is this blue zone.
• The center zone is the yellow-colored region that is the brightest part of the flame.
• The middle zone is a fairly heated zone with a restricted oxygen supply.
• The flame's inner zone is black.

Non-luminous zone is the flame's outermost zone.

• Anu should boil the water in the flame's hottest zone, which is the flame's outermost zone or non-luminous zone.
• Since the uppermost zone provides the greatest heat, the non-luminous zone is optimal for fast boiling water.