I got this demonstration to work and on the first try! Unfortunately the video I took was one of the worst videos in the history of videos so I'll just share the picture. This is demonstration 3 in the section of the AMI geography album (KotU) titled "The Work of Air: Prelude to the Winds."
Note to self: If you are going to keep posting pictures of science experiments on a cookie sheet, use one of the shiny cookie sheets.
In this presentation we want to show that when hot air rises a void is created and other air will be drawn in to fill that void. We review that hot air rises with the visual of the smoke from a stick of incense. We used lavender. I held the incense like a sparkler and demonstrated that the smoke rises straight up from the stick no matter what position I hold it in. In hindsight, you may not want to train your child to wave burning incense sticks around like a sparkler. Next we need a sturdy tube with a door. I made mine from a manila file folder and some tape. A teal light candle at the bottom of the tube will heat the air so that it rises. When the incense is placed near enough to the door the smoke suddenly stops traveling vertically and makes a very impressive horizontal jump toward the open door and smoke starts coming out of the top. We definitely walked over to our fireplace immediately after this and made the connection between this experiment and how our fireplace and chimney work.
The script for this demonstration in the KotU album worked beautifully. I appreciated having simple sentences provided to model. I would have gotten wrapped up in my own tongue trying to explain this one. The directions call for clay for holding the incense stick. I didn't need it until I needed my hands free to take a picture. Perhaps the child would place the stick into the clay in several different positions rather than treat the incense like a sparkler.
On a side note, I have attempted Demonstration One another ten different times with the addition of things like duct tape with no luck.