Quick Question About Plastic Bottle Delfating

[QuantamMan]

Hi Guys,

I am new here, but I have a quick question.
I had a somewhat tepid liquid in a plastic soda plastic 2L bottle
When I tightened the cap to close it all was well and normal
After a day a portion of the top of the bottle deflated, as if oxygen was sucked out

Can someone explain this process?

Thank You
QM

 

[omoplata]

Was the water warmer than room temperature?

If yes, the temperature of the bottle and the water became equal after you closed the cap. The air volume contracted as its temperature went down. It couldn't get air from outside because the cap was closed.

http://en.wikipedia.org/wiki/Thermal_expansion"

 

[QuantamMan]

Was the water warmer than room temperature?

yes, we have been having snowfall lately, it's cold right now

 

[omoplata]

Here is a clearer and more correct explanation.

Let's assume when you closed the cap, the bottle, the air inside it, and the soda were at the same temperature. When you closed the cap, matter (air) couldn't move in or out of the bottle, so you made it a http://en.wikipedia.org/wiki/Closed_system" . So air contracted more as the temperature reduced. That's why the soda volume seemed to be the same but the air volume appeared to be less.

You can look up these terms in your science textbooks too.