I packed a fridge with temperature sensors and took over the temperature control in order to have extra cold beer.
One of those sensors is submerged in the middle of a container containing a 4.5% seltzer so I can get an idea of the temperature inside the surrounding beer cans.
This submerged sensor is the yellow curve at the bottom:
I'm trying to explain what happened around 6:25.
I was maintaining the seltzer at -3°C and I confirmed it was not frozen. However I think I was maintaining it slightly below it's freezing point.
This morning I saw that it somehow raised in temperature abruptly and it's now in this jelly/half frozen state.
I'd like to know why this really sharp raise in temperature. Is this how freezing works?