Can a candle burn in a spaceship (in microgravity)?
Image Credit: NASA.
Answer. Posted on Thursday, March 5, 2015.
When the candle is burning, the reaction uses oxygen and there has to be a way by which oxygen is constantly brought to the flame. At the Earth, the hot air is lighter than cold air and the heated air around the candle is pushed upwards and replaced by colder, oxygen-rich air coming from below. The flame of a candle burned in a spaceship forms a sphere surrounding the wick. Diffusion feeds the flame with oxygen. The temperature of the flame is too low for the yellow color, thereby the flame in the spaceship is a blue color.