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 light emission from 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, and the effect of gravity on flame shape is discussed, highlighting how flames behave differently in zero gravity.

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

• The presence of soot particles

• The type of fuel used

• Atomic transitions and quantum mechanics

• The temperature of the flame

Why don't we see humans glowing with visible light?

• Humans emit light in the ultraviolet spectrum

• Humans emit light in the microwave spectrum

• Humans are not hot enough to emit visible light

• Humans are too small to emit visible light

What is the process called that makes all objects glow with light based on their temperature?

• Infrared Emission

• Thermal Emission

• Black Body Radiation

• Quantum Transition

How does gravity affect the shape of flames?

• It causes flames to spread outwards like a balloon

• It makes flames rise and form a tongue-like shape

• It compresses flames into a spherical shape

• It has no effect on the shape of flames

What happens to a flame in zero gravity?

• It becomes brighter and hotter

• It extinguishes immediately

• It spreads outwards in all directions

• It forms a perfect sphere