In the video below, Dianna Cowern (Physics Girl) shows the interesting thing that happens when the flame of a candle is exposed to falling.
While I understand the need to make the science accessible and fun in a short video, Dianna describes the effects of freefall on the candle flame to be a consequence of “taking away gravity”, and she also says that, “Falling towards the Earth pulled down by gravity, is just like floating out in space with no gravity at all”. Neither of these things is true.
The gravity that we are talking about, is that produced by the Earth. To “take away gravity” or to “have no gravity”, the Earth would have to disappear! What really happens during freefall that gives the candle flame that shape is that the forces that oppose gravity are diminished or nullified. Because this eliminates buoyancy, hot air can no longer rise. This is counterintuitive, and visualizing it is more complicated and difficult to explain in a video, but if you are interested, I wrote a post about it here.
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