Boilingwater by lowering air pressure (link to high res. version in remarks)
Boiling water by lowering air pressure (link to high res. version in comments)
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Friday, January 22, 2021
Nikola Tesla
I do not think you can name many great inventions that have been made by married men
Albert Einstein
Imagination is more important than knowledge.
I’m kinda bummed he shut off the pump before it got interesting.
Liquids can’t exist in a vacuum, so if you keep pumping the air out, whatever doesn’t boil off will freeze solid.
Edit: [Video of someone doing the full experiment](https://www.youtube.com/watch?v=y4BGV7-1lhs)
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This is a low quality render of what I thought was a pretty neato video. MUuuuuuch larger file can be found hosted at archive.org: https://archive.org/details/BoilingWaterDone (which happens to be running a fund-raiser today).
What’s the rotor for?
what would’ve happened if you kept the pressure low? would the water boil indefinitely?
Did you degasify the water first? Often you can see dissolved gas come out of the water before it boils.
What happens if they proceed to boil all the water off and then quickly bring back the pressure to 1 atm? Will the boiled off water “rain”?
I love physics. This is the exact same phenomenon that causes Cavitation in pumps. Localized low pressure zones that cause water to vaporize.
So this is what happens to the human body if exposed to outer space?
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This is how an Air Conditioning system works. Just replace water with refrigerant and vacuum for low pressure.
If the pump was aloud to continue. The water would continue to boil. The water molecules leaving the surface tension also take away energy. That water will eventually turn to ice. Then you break the vacuum and it turns back into a liquid.
People in the HVAC field use this knolage everyday. When we open a refrigeration system for repairs. We have to remove any moisture that has gotten into the system from the air. So we use a vacuum pump. After we use very precise tools to verify the level of vacuum and that there is no longer moisture in the system. We can add the refrigerant back into the system without worry of contamination. Here is the thing.
As I stated before. If you pull a vacuum on liquid you run the risk of that liquid turning to ice. Then it is so much harder to boil off. It will continue to evaporate and leave the system. It just takes a long time. That is why we have to use the right sized vacuum pump for the job. But I could go on all day about this stuff.
it’s not boiling, it’s just pulling all the air bubble out of the water giving it the appearance of boiling water.
As boiling water is often used for sterilizing the water to kill pathogens, though raising the water temperature is the point, would boiling the water in a vacuum also sterilize the water, perhaps by breaking down cellular bonds that keep the pathogens alive? Could vacuum replace heat to kill pathogens?