Vacuum Form
Posted in Aircraft Model by admin
on July 17, 2010
Why did the vacuum form in a plastic bottle that had some leftover soda in it for months?
I left some soda in a small plastic bottle(same plastic as the 2litre pet I think), corked it tight and left it in my desk drawer for months, it gradually showed signs of collapsing like a vacuum was forming inside, the volume of liquid did not change much and did not change color. The drawer is closed most of the time and the office is airconditioned.
I left some soda in a small plastic bottle(same plastic as the 2litre pet I think), corked it tight and left it in my desk drawer for months, it gradually showed signs of collapsing like a vacuum was forming inside, the volume of liquid did not change much and did not change color. The drawer is closed most of the time and the office is airconditioned.
Note: The bottle continues to shrink over the time.
Note: The bottle continues to shrink over the time.
The air trapped inside may have been warmer when you corked it, than it is now inside your desk. As air cools, in takes up less volume and when heated it expands. That could be one theory. Try this; Put some hot water in an empty milk jug, close the lid then swish it around. Now dump out the hot water, fill it with some cold water, close the lid and swish it around again. Voila, you have a vacuum.
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