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What is a Flame? Video Lecture - Class 8

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1. What is a flame?
A flame is a visible, gaseous part of a fire. It occurs when certain gases, such as those from a fuel source, are heated to their ignition temperature and react with oxygen in the air.
2. How does a flame form?
A flame forms when a fuel source, such as wood or gasoline, is heated to its ignition temperature. The heat causes the fuel molecules to break apart, releasing flammable gases. These gases then react with oxygen from the air, resulting in the emission of light and heat, which we perceive as a flame.
3. What are the different parts of a flame?
A flame consists of several visible parts. The innermost part is called the blue cone or the inner cone, which is the hottest part of the flame. Surrounding the inner cone is the yellowish zone known as the outer cone. Above the outer cone is the non-luminous, pale blue region called the oxidizing zone. Finally, there is the dark region known as the fuel vapor zone.
4. Can a flame exist without oxygen?
No, a flame cannot exist without oxygen. Oxygen is an essential component for the combustion process that sustains a flame. It acts as the oxidizer, combining with the fuel molecules to release energy in the form of light and heat. Without oxygen, the fuel would not be able to burn, and therefore, a flame would not be formed.
5. What factors influence the color of a flame?
The color of a flame can be influenced by various factors. One of the main factors is the type of fuel being burned. Different fuels produce different colors when burned. For example, a fuel rich in carbon produces a yellow flame, while burning copper produces a green flame. Additionally, the temperature of the flame can also affect its color, with higher temperatures often resulting in a bluish color.
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