Understanding Fire

What is required for a fuel to catch fire?

• It should be in a liquid state.

• It needs to reach its ignition temperature.

• It must be mixed with water.

• It must be exposed to sunlight.

What is smoke primarily composed of?

• Hydrogen, carbon, and oxygen

• Nitrogen, carbon dioxide, and helium

• Oxygen, nitrogen, and sulfur

• Carbon dioxide, water vapor, and methane

How does gasoline differ from wood when it burns?

• Gasoline produces more smoke.

• Gasoline burns without leaving char.

• Gasoline leaves behind more ash.

• Gasoline requires a higher ignition temperature.

What causes flames to rise and appear pointed?

• The color of the flame

• The presence of sodium in the fuel

• The absence of gravity

• The hot gases being lighter than the surrounding air

What determines the color of a flame?

• The amount of smoke produced

• The presence of water vapor

• The speed of combustion

• The type of fuel and its temperature