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I was thinking about this today. I wonder if each "wire" is a long tube containing many thin wires, and hence is acting like an air bottle, with the air in the spaces between the thin wires.<br>
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If so, then the air would have to travel to the ends of the tube before it can escape, and - when the pressures are very low - this random walk may take a long time.</div>
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A possible solution would be to cut windows every cm or so in the plastic tubing.</div>
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/Bevin</div>
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