What is Fire?

The video explores the nature of fire, explaining why gas flames are blue and wood fires are orange. It delves into the physics of flames, discussing clean and impure flames, and the role of quantum mechanics. The concept of black-body radiation is introduced to explain why hot objects glow. The video also covers how gravity shapes flames, contrasting flame behavior in normal and zero gravity environments.

What causes the blue color in a clean-burning gas flame?

• Soot particles

• Black-body radiation

• Infrared emission

• Atomic transitions

Why don't we see the blue light in a wood fire?

• It's reflected by the smoke

• It's too faint to be visible

• It's overpowered by the red-hot glow of soot

• It's absorbed by the wood

What is the process called that makes hot objects glow based on their temperature?

• Quantum mechanics

• Thermal expansion

• Convection

• Black-body radiation

Why do flames have a tongue-like shape?

• Because of the Earth's gravity and convection

• Due to the chemical composition of the fuel

• Due to the color of the flame

• Because of the wind direction

How does a flame behave in zero gravity?

• It becomes more intense

• It forms a spiral shape

• It extinguishes immediately

• It spreads outwards like a balloon