Comment on 'Dune'-Inspired Spacesuit Turns Astronauts' Urine into Drinkable WaterparentComments−jimnotgym2yOr a biro? Don't they work by capillary action rather than gravity?−extraduder_ire2yYes. The only advantage of the "space pen" is that it works upside down. Ballpoint pens work fine in microgravity, but not directly inverted.
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Or a biro? Don't they work by capillary action rather than gravity?
Yes. The only advantage of the "space pen" is that it works upside down. Ballpoint pens work fine in microgravity, but not directly inverted.