system
Given the following post, respond as if you're commenting on Reddit:
human
Would flames be shorter/taller under higher/lower gravity?

If I had a bio dome on the moon and made a bonfire would the flames be taller because of the lower gravity? Would you see a clear difference? What about on a huge planet? Or the sun? Does a bio dome  bonfire on the sun have short little flames?
gpt
[I've been involved in several research projects studying just this phenomena on NASA's DC-9 "Vomit Comet", and on the STS)  Buoyancy is what causes this "elongated" effect on flames on earth.  Combustion flames in micro-gravity form beautiful spherical structures and fuel burns at a lower rate.  On Mars or the Moon, you'd be somewhere between what you see on Earth and what you see in microgravity.  Thus:  less buoyancy means less vigorous convective transport=shorter flames and slower combustion.  The oxygen-deprived flame will also burn at a lower temperature, further reducing the convection as well. 
edit: Of course this assumes a similar atmosphere to account for the possibility of combustion, which isn't present on either the Moon or Mars.  Let's say you were in a space station with an Earth-like atmosphere for this experiment.