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The tube could be used as a metering device......in air conditioning we meter the flow of freon...a gas...through a capillary tube the length and inside diameter determine the rate of flow and help control the pressure of the release...
Just a thought
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"Iron rusts with disuse, stagnant water loses its purity and in cold water freezes. Even so does inaction sap the vigor of the mind"
Leonardo Da Vinci
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