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Dubanx t1_jdr6l6f wrote

Reply to comment by The_Flurr in TIL: Thanks to poor internal communication at NASA, information about a spacesuit water leak wasn't properly communicated. Later, Astronaut Luca Parmitano almost drowned on a July, 2013 ISS space walk, his helmet filling with several liters of water before they could get him back inside. by OvidPerl

>Your skin and sweat equalise in temperature until the sweat evaporates or is wicked away.

That doesn't even make sense. Your sweat literally comes from your body. It starts at the exact same temperature as your body. It can't take warmth from your body until it's the same temperature as the rest of your body since it was already at body temperature to begin with.

Sweating is entirely a form of evaporative cooling. Even the wikipedia articles says as much.

Buy a bottle of canned air and spray it. You can feel the bottle cool down dramatically to the point where it can cause frostbite as the compressed liquid inside turns to vapor. To the point where the bottle will stop working if you run it for too long.

Take a cooler full of ice, place a thermometer in it, and add salt. Since the ice will melt without heat being added the water will drop in temperature dramatically compared to the ice you started with.

Here is a god damn youtube video of someone freezing water by boiling it in a vacuum.

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The_Flurr t1_jdrcp2x wrote

Again, it may work in a vacuum I an enclosed space where the vapour continues to be in contact with the liquid water. In open space the vapor would dissipate too quickly.

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Dubanx t1_jdrllmt wrote

It's a vacuum in the video. The water vapor is being removed by the pump as fast as it boils. If it wasn't, it would stop being a vacuum.

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