![]() Unlike fires on Earth, there are no visible flames. Instead of forming a teardrop shape, a candle in space forms a sphere of fire. Likewise, the air heated because of a candle flame doesn’t rise but stays stationary. However, in the microgravity on the International Space Station, oil doesn’t separate from water and sediment in water will disperse evenly and not sink. Oil will rise to the top of water for the same reason. On Earth, the same process causes heavier material to sink to the bottom of a lake and form sediment. ![]() This causes the flame to form its signature shape. ![]() The lighter, hotter air rises and pulls the colder air behind it. It happens because the buoyancy of air changes depending on the temperature. On Earth with its constant gravity, a candle flame forms into the shape of a teardrop. ![]()
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