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From: "::darkshadows::" <bat@cave.org>
Newsgroups: alt.fan.rolex
Subject: Why do carbonated drinks seem to bubble more in plastic cups?
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Date: Fri, 12 Jun 2009 04:36:47 -0500
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Why do carbonated drinks seem to bubble more in plastic cups?
The properties and characteristics of a particular member of the
plastics family, PET (polyethylene terephthalate), causes carbonated
drinks to bubble more in plastic cups.
PET, a clear, strong polymer, has unsurpassed gas and moisture barrier
properties. Its ability to contain carbon dioxide makes it the
plastic, and the material of choice for carbonated beverage
containers.
PET containers have no competition in retaining carbon dioxide, the
gas responsible for the effervescent, bubbling effect. The property
that gives rise to a vast number of bubbles is the unique barrier
layers, which prevent the loss of carbonation. The barrier layers
serve to keep the container airtight, which keeps the carbon dioxide
from leaking out, and oxygen from entering. This is why containers
made from PET plastic keep carbonated beverages colder, more
flavorful, and fizzier.
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