Hot-it's closest to Sun.
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The surface temperature ranges from 80 K to 700 K.
No, Mercury is too hot to live on.
It is not recommended to go from hot to cold or cold to hot too quickly as it can put stress on the body and potentially lead to health issues such as hypothermia, heat exhaustion, or potentially shock. It is better to gradually transition between temperatures to allow the body to adjust.
Drinking cold water mixed with hot water may help regulate body temperature and provide relief from sore throat or congestion. However, be cautious of possible discomfort due to extreme temperatures and the risk of burns if the hot water is too hot. It's generally safe in moderation, but it's best to listen to your body and drink water at a comfortable temperature.
Mercury has no atmosphere, so humans there would require the same artificial environment as on the Moon or in space. And except for a few locations, the temperature is either too hot or too cold (actually both over any long period of time). The one survival item likely to be found on Mercury is liquid water, which should be found frozen as ice in deep craters near the poles.