Last night I filled a 20 fl oz bottle (http://www.thenibble.com/reviews/main/beverages/soft-drinks/boylans-mash.asp) with lukewarm water from my tap. I filled the bottle pretty much to the brim, capped it, and put it in my freezer.
Today, I took the bottle out, and left it on the table in my far-too-hot room for 10 minutes or so. When I unscrewed the cap, water flew everywhere, like a can of soda that's been shaken up really intensely. What happened? Can anyone explain this?