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Flame refers to a visible, gaseous body of matter that emerges from a chemical reaction between oxygen and a combustible substance. Flames are generally characterized by their brightness, shape, color, temperature, and the amount of light, heat, and smoke produced. They usually occur during combustion, which is a process that involves the release of energy through the oxidation of a fuel source.

There are several types of flames, including diffusion, premixed, laminar, and turbulent flames. Diffusion flames occur when air and fuel mix at a slow rate, and the flame is generally a yellowish-orange color. Premixed flames, on the other hand, occur when air and fuel mix rapidly, and the flames are usually blue in color. Laminar flames occur when there is no turbulence in the flame, while turbulent flames have a lot of turbulence and are usually more efficient at burning fuel.

Flames are widely used in many applications such as heating, lighting, cooking, and industrial processes. They can also be dangerous as they can cause fires and explosions if they get out of control. Flame retardants are substances that are added to materials to delay the onset or slow the spread of flames to reduce the risks of fire.

flames are a visible body of matter that occurs during combustion. They have different colors, shapes, and temperatures depending on the type of combustion and are widely used in various applications. However, they can also be dangerous and require caution and measures such as flame retardants to ensure safety.