If i had access to an airlock that could depressurize to ~0 bar could i brew a cup of tea with it?
I’m not a scientist by any means but I’m pretty sure it’s the temperature that matters when steeping the tea. You can use hot - but not boiling - water just fine.
So I’d say: probably not
you can make tea by just putting a tea bag in cold water and letting it sit for a few hours.
We nake iced tea all the time without any hot water it tastes the same as if you boil the water. Just takes longer.
I don’t really think tea brewed at a lower temperature tastes the same, I’m guessing it’s because the relative rates that different flavor compounds go from the tea to the water change at different temperatures, but the main noticeable effect is that tea brewed cold is usually less astringent for a given concentration of other flavor.
It’s not the boiling that’s the important factor - it’s the temperature.
You could make a cup of tea with it, but it wouldn’t be much different than just plopping a teabag in room-temperature water for the same amount of time.
This is illustrated when boiling something at altitude. Because the boiling point is lower, you have to do it longer to compensate.
Their might be a mild improvement over still room temp water as the potential boil would agitate the tea a bit to speed up the steaping
If you place a tea bag in a cup of water at 20C in a thermally isolated vacuum chamber, when the chamber pressure is reduced to or below the vapor pressure of water at 20C (about 17 torr, or 1/3 psi), it will begin to boil. The vapor produced will be at 20C and the water in the cup will be 20C and begin to decrease, because of latent heat of vaporization needed for the liquid/gas phase change. The water will continue to boil as long as the pressure is maintained at or below the vapor pressure of water at that temperature. Eventually, the water reaches 0C. Then it will stop boiling and begin to freeze as the latent heat of fusion provides the necessary heat to continue evaporation. When all the water has converted to ice, the vapor pressure is greatly reduced. The ice will sublime (go from solid to gas) still, but as that continues to cool the ice, the vapor pressure also drops. As the temperature drops, sublimation will slow until it is nearly zero. So you would end up with a tea bag encased in ice.
In your example, if you suddenly exposed to the cup and tea bag to the vacuum of space by rapidly venting the air, the water would explosively evaporate, shredding the tea bag. You’d be left with bits of tea leaves, an empty cup, and a lot of very fine ice crystals.
isn’t depressurizing expanding a material, so it absorbs extra heat meaning you would boil it into ice dust, so more like a slurpy, instead of tee? (you know, like a fridge lets the cooling agent decompress to absorb heat and it gets cool.)
