[scientizscht (OP)]

Hello

Is it possible to have a sealed bottle partially filled with water and partially with void?

How will the water sit in the bottle? Just like the bottles with water and some air?

Thanks!

[vhfpmr]

By void you mean a vacuum?

I think the water will boil until the pressure has raised the boiling point to match the ambient temperature.

[evan_au]

Here's one way of doing it:

Now if you just used a non-compressible bottle instead of a compressible drum, you would end up with the bottle half-filled with water, and the remainder filled with a low-pressure water vapor.

By reducing the temperature, you can further reduce the pressure of the water vapor.
- You can work it out from the phase diagram of water:
- at a temperature of 0.1C 0.01C, you can have a container with liquid water and water vapor at a pressure around 0.6% of normal Earth atmospheric pressure (if I am reading this correctly...).
- This is called the "triple point of water", because water can coexist as a solid, a liquid and a gas; you can have ice floating in boiling water!
See: https://en.wikipedia.org/wiki/Phase_diagram#Crystals

[Bored chemist]

at a temperature of 0.1C, you can have a container with liquid water and water vapor at a pressure around 0.6% of normal Earth atmospheric pressure (if I am reading this correctly...).

Close...
It's 0.01C
And it's important because it's the defined point on the Kelvin temperature scale; 273.16K exactly.

But a bottle with just water vapour and water looks pretty much the same as one with water and (damp) air.

Things get interesting again at 373.946 °C, 217.75 atm
https://en.wikipedia.org/wiki/Critical_point_(thermodynamics)