Candles rotating about an axis.

Centrifugal and Centripetal Acceleration. Lighted Candles Rotated about an Axis. (The Aberrant Candle Flame.) The candle flames are observed to point inward, toward the axis of rotation. Inside the glass shield, centripetal acceleration pushes the air outwards; the less dense flame points inwards. (It is best observed in a dark room. Focus on one spot as the candles move by.)