Lets say we had a twister, below it there's a lit candle, after a while the blades of the twister move. I know its because the air around the flame is heated and so the air rises. But can we say heat energy converts to kinetic energy in this situation. Becuause its not becuz the air got heated so it moved it is because the air there got lighter(less dense) so the air above it moved down and it moved up. I mean lets say we had a little particle in a vaccum its not go gonna move up just because its heated right?