Understanding Fire and Flames

Which of the following was historically considered a fundamental element?

• Hydrogen

• Carbon

• Fire

• Oxygen

How many elements are known today?

• 4

• 50

• 118

• 200

What is fire primarily considered as?

• A solid

• A liquid

• A gas

• A process

What is necessary for a fire to start?

• Carbon dioxide

• Nitrogen

• Fuel and oxygen

• Water

What are flames primarily composed of?

• Solids

• Liquids

• Gases

• Plasma

Which state of matter is sometimes associated with flames?

• Solid

• Plasma

• Liquid

• Gas

What is a characteristic of the plasma state?

• It is a liquid

• It is cold

• It is a solid

• It consists of ions and electrons

What can cause a gas to enter the plasma state?

• Cooling

• Heating to thousands of degrees

• Compressing

• Adding water

Which of the following flames is hot enough to be in the plasma state?

• Incense stick flame

• Gas burner flame

• Candle flame

• Acetylene torch flame

What shape is commonly associated with flames?

• Circular

• Teardrop

• Rectangular

• Square