Why do we wrap a blanket around a person whose clothes have caught fire?
For a fire to burn, all three elements heat, fuel and oxygen of the fire triangle must be present. If any of these is cut off, fire will be put out. When a fire blanket completely surrounds the person whose clothes caught fire, it seals the person’s body surface around the fire and cuts off the oxygen supply to the fire; thereby, putting out the fire . Thus, fire blanket acts as a fire extinguisher and stops the fire from spreading.
Living Science (2020, 2021)