It also may be contained in warm air rising from appliances. (rismedia.com)
When the firing was complete, the vents in the hot plate were opened and hot air rose from the pile of stones into the room to be heated. (lowtechmagazine.com)
The second cell consists of air rising in the middle latitudes — about 30 to 60 degrees north and south — and then falling again near the poles. (scientificamerican.com)