This CSCOPE Science Teacher Demonstration contains possible fire and smoke hazards.
Fire Hazard: Igniting a rag, then blowing out the flame.
Smoke Hazard: Smoke from the burning rag diffuses through the room.
Too much smoke could cause respiratory problems and/or set off smoke alarms.
Smoke from the smoldering rag will be drawn into the chimney on the container, move across the container and out chimney A and into the classroom.
No safety cautions were given for this investigation. How does the teacher stop the rag from smoking? How is the smoke removed from the classroom.
Solution: Use a punk stick or incense stick. Smoke from a match after it is light and blown out works and doesn’t produce a large amount of smoke. Shine a flashlight into the container and the particles in the smoke will reflect the light and make the motion of the smoke easier to see.
Place the container in a safety hood with an exhaust if available.
Perform the experiment outdoors, but do not use a smoking rag.