PDA

View Full Version : Water Bottle Physics



Scamp
2009-Jun-12, 07:49 PM
At my office we have a small fridge I use to keep water bottles cool.

The other day I pulled one out and accidentally dropped it. When I picked it up the contents had gone from liquid to a frozen slushy.

So I tried it with another bottle, I pulled it out of the fridge and it's all liquid but as soon as I bang it against something it turns to slush. Very cool but I'm not sure why it happens.

Tucson_Tim
2009-Jun-12, 07:54 PM
Supercooling?

http://en.wikipedia.org/wiki/Supercooling

http://www.newton.dep.anl.gov/askasci/gen01/gen01672.htm



Have you ever placed a small, unopened bottle of pure water in the freezer, taken it out before it crystallized, but by shaking the bottle or squeezing on the plastic container - induced crystallization?

grant hutchison
2009-Jun-12, 08:01 PM
Yes indeed: supercooling.
We've had some discussion of supercooling in various threads. I did some basic sums about why water turns to slush (rather than solid ice) here (http://www.bautforum.com/1481759-post97.html); a post which also provides a link to a YouTube video of the phenomenon.

Grant Hutchison