If you were an astronaut on the surface of Mars, and you happened to spill your bottle of drinking water, a very strange thing would happen.
The water would instantly freeze and boil away at the same time.
At that reduced air pressure, water would boil even at 81 below.
Can liquid water exist on Mars?
Some liquid water may occur transiently on the Martian surface today, but limited to traces of dissolved moisture from the atmosphere and thin films, which are challenging environments for known life.
Why can permanent liquid water not exist on Mars today?
Many scientists believe that liquid water does not and cannot exist on the surface of Mars today. Although surface water may have been plentiful in Mars’ past, they say, the current conditions of freezing temperatures and a thin atmosphere mean that any water on Mars would have to be deep underground.
Would water freeze on Mars?
There may even be enough frozen water beneath Mars’ surface to fill a large ocean if melted. A cup of liquid water transported Star Trek-style to the surface of Mars would instantly freeze or boil (depending on the local combination of temperature and pressure).