Chemistry Combustion & Flame Part 11 (Structure of Flames) Class 8 VIII

TL;DR

The flame of a candle has three zones - outer, middle, and inner - with the outer zone being the hottest.

Transcript

hello friends this video on combustion and gamepad 11 is brought to you by exam feel calm no more feel from exam so let us look at the structure of a flame so if you closely observe the flame of a candle you will see that it is not a one layered structure so if you look at it from far away you it just looks like a yellowish orange structure but if ... Read More

Key Insights

• 🖕 The flame of a candle has three zones: outer (bluish), middle (yellowish), and inner (blackish).
• 😅 The outer zone of the flame is the hottest, reaching temperatures as high as 600 degrees Celsius.
• 🫠 The outer zone is used for heating purposes, such as melting metals for jewelry-making.
• 😅 Passing your finger through the inner zone of the flame quickly is possible because it is not hot enough to burn.
• 🖕 Complete combustion occurs in the outer zone, while partial combustion occurs in the middle zone.
• 🙂 The outer zone is non-luminous and doesn't produce much light compared to the yellowish orange luminous middle zone.
• 😅 The inner zone of the flame contains only unburned vapors and is the least hot.

Questions & Answers

Q: How is the flame of a candle structured?

The flame of a candle has three layers: outer, middle, and inner. The outer zone is bluish, the middle zone is yellowish, and the inner zone is blackish.

Q: Which part of the flame is the hottest?

The outer zone of the flame is the hottest, with a temperature as high as 600 degrees Celsius.

Q: Why does the outer zone of the flame produce more heat?

The outer zone is where complete combustion takes place, resulting in the production of a lot of heat.

Q: How is the temperature different in each zone of the flame?

The outer zone is the hottest, the middle zone is moderately hot, and the inner zone is the least hot.

Q: Why can you pass your finger through the inner zone of the flame without getting burned?

The inner zone is not hot enough to burn your finger because it contains only unburned vapors, while the outer zone is extremely hot.

Q: How is the flame used for heating purposes?

The outer zone of the flame is used for heating objects, such as melting metals like gold and silver to create jewelry.

Q: What is the difference between complete combustion and partial combustion?

Complete combustion occurs in the outer zone, while partial combustion occurs in the middle zone.

Q: Why is the outer zone of the flame called the non-luminous zone?

The outer zone doesn't produce much light, unlike the middle zone, which is called the luminous zone due to its yellowish orange color.

Summary & Key Takeaways

• The flame of a candle has a layered structure with three zones: outer (bluish), middle (yellowish), and inner (blackish).

• The outer zone of the flame is the hottest, while the inner zone is the least hot.

• The outer zone is used for heating purposes, such as melting metals for jewelry-making.