Smoke

Smoke is a cloud of very small, solid particles that is made when something is burned with a flame, such as wood or paper.

Smoke can be bad because if it goes into the lungs of a person, it can hurt their lungs or even kill them (for example, in a house fire). Most people think that they are always able to see smoke, but people cannot see some types of smoke: they are invisible.

Smoke removal systems redistribute gas flows and reduce the temperature and concentration of smoke during a fire. This helps in evacuating people, limiting the spread of fire; and extinguishing the fire.^[1]

• 
  Oil fire
• 
  Candle smoke
• 
  Campfire in Africa
• 
  Bonfire smoking

1. ↑ "Highrise building smoke removal" (PDF). Sacramento Fire Department.