what fire looks like in freefall

Fire Behaves Very Oddly in Space

The flames had broken apart into tiny balls that moved around like UFOs. "I thought I had done something wrong," he recalled. Some of his colleagues didn't believe him when he described the experiment. Indeed, "it was ridiculous. No one had ever seen anything like it." [...]

"Flame balls are the weakest flames we have," says Ronney. "Compared to a birthday candle's 50 to 100 watts, a flame ball produces only 1 to 2 watts of thermal power. They burn using very little fuel. It's almost as if a hydrogen-burning flame's last line of defense as it approaches extinction is to draw itself into a simple ball." [...]