Coke physics (ice and pressure)

  • #1
Funny thing just happened. I left my coke in the freezer, expecting the bottle to be busted I found that it wasn't even frozen at all. Liquid all the way through. Figured it was that new fake sugar chemical, but when I unscrewed the cap it instantly turned to ice.

So I guess you can prevent water from freezing if you have enough pressure on it, by preventing it from expanding it doesn't crystallize.

How cold can you get water in this case without turning it to ice? As cold as you want?

Or does the water stop releasing heat.
 

Answers and Replies

  • #2
kjl
23
1
I don't know if anybody's ever figured out the phase diagram for Coke :) but it sounds like it has the same "backwards" property that water has (that increasing pressure will keep it as a liquid in colder temperatures), which makes sense, since it's mostly water.

400px-Water_phase_diagram.svg.png


and see:
http://en.wikipedia.org/wiki/Properties_of_water

Pressure on the Y scale, temperature on the X scale), we're normally at about 10^5 Pa pressure, showing that the freezing point is normally around 273K, but the freezing point drops lower as the pressure increases.
 
  • #4
Is it possible to get it down to 1 degree Kelvin without freezing? It looks like from the charter there that there is a limit.
 
  • #7
I think they pressurize the bottle when they pack it. So there was no way for it to expand in the first place. It was diet so there was no sugar in it, it's basically just flavored water.
 

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