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How can a water bottle shrink?
After drinking the bottled water, I made tea in the bottle. I put in a tea bag and poured hot water to the shoulder of the bottle. The water came up and over the top of the bottle as the bottle shrank. The circular label fell down. I measured the bottle compared to a new one and it is 1 inch shorter and 1/2 inch less in diameter. I know proteins shrink when heated but not plastics. It is an extruded bottle.
interesting question here is: why plastics? Why
don't metal or glass bottles do it? All solid materials have some degree
of elasticity, the ability to bounce back from a push or recover their
original shape after being bent, twisted, etc. In materials like glass or
metal the force restoring the shape comes from the strain on interatomic
chemical bonds that the change in shape causes. This force does not change
much with temperature. On the other hand, plastics are made of huge
molecules that look like very long flexible strings. Ordinarily these
molecules are found in the shape of loose tangled up balls (like the yarn
after the cat gets done with it). If a piece of plastic is distorted, most
of the distortion is accounted for not by strain on chemical bonds but by
the straightening and flattening out of the shapes of the molecules (think
of pulling the cat's ball of yarn apart until it's longer in one
direction). Now at high temperatures there is a lot of jiggling motion
going on at the molecular level, and this jiggling will tend to restore the
molecules to their original roundish as-tangled- up-as-possible state, just
the way giving the ball of yarn back to the cat would. This is the origin
of the force that lets plastics bounce back. Notice that unlike the case
for metal or glass this force will change with temperature. If I were to
stretch the plastic at a sufficiently low temperature (i.e. make a bottle
out of it in the way plastic bottles are usually made) there would not be
enough jiggling going on at the molecular level to restore the shapes of
the molecules and hence the shape of the plastic. But were I then later to
raise the temperature sufficiently (by chucking the bottle into the fire) I
would restore the jiggling motion and allow the plastic to bounce back.
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 NEW PINK Nylon Water Bottle Cell Zipper Saddle Bag  US $15.99
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Pamby the persian kitty- in the water bottle bag
