so when we light 2 candles and put them on the edge of a bike tire and we spin the bike tire the candle flames lean in towards the center. And we put a glass chimney around the candles to protect the flames but the top is open . like seen here around the 4.5 minute mark in this video. . I was told that the candle flames lean in because as they go around the air inside the chimney gets pushed to the back , therefore creating a higher pressure and pushing the flame in towards the center . But would happen if we did this in a vacuum , I mean like have a propane and oxygen injection right on the edge of the tire and a spark plug so that the flame is not obstructed by an atmosphere but it can still burn , which way would the candle flame lean , or would it lean at all .