Yesterday we were cleaning out the fridge, and while doing so we put all the fridge content on our balcony, to keep it cold. It’s about -10 degrees Celcius outside.
The content included, among other things, three packages of milk (“paper-boxes”), and two packages of tomato soup, same kind of “paper-box” (Tetrapak?). One of the milk packages had been opened, as well as one of the soup packages.
Today when I went to pick up our food from the balcony (yes, we were lazy!) I was not surprised to find that most items were now frozen solid, but what surprised me was that:
- The milk that had been opened (but was allmost full) was frozen solid, while both (identical) unopened milk packages was still in liquid form.
- The soup that was opened (and almost full) was also frozen solid, while its identical unopened package also was still in liquid form.
How do I explain this? My theories are:
- The opened containers had slightly less content
- The opened containers had slightly more air movement inside them
- The unopened containers might have a tiny bit of underpressure in them
But even theory 1+2+3 does not explain the big difference between frozen solid and “practically liquid”.
Please help me explain this!
Ola / Sweden