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0,1 ° C (or 273,16 Kelvin)

The freezing point of water increases as the pressure decreases. Because ice fills up more space than water. This effect is however so discrete, that at the average pressure on Mars, which is only 0,6 % of the pressure on earth, the freezing point will have increased by 0,1 ° Celsius

This pressure is however critical and may vary (altitude, winds...)

Where the pressure drops below 0,6 % of the pressure on earth, liquid water becomes unstable. It will boil until it loses enough heat to make the remaining liquid freeze solid.

As Mars Curiosity has measured positive ground temperature of 2,85°C (at noon), it proves that the existence of liquid water on Mars is possible.

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