| 21. | A free expansion is typically achieved by opening a stopcock that allows the gas to expand into a vacuum.
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| 22. | Domestic stopcock cover set into the pavement outside a house in north Birmingham, with the initials " CBWD"
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| 23. | These valves have also been used as a grease-free alternative to straight bored stopcocks common to Schlenk flasks.
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| 24. | Stopcocks are a smooth tampered plug or rotor with a handle, which fits into a corresponding ground glass female joint.
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| 25. | The stopcock is a smooth tampered plug or rotor with a handle, which fits into a corresponding ground glass female joint.
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| 26. | Stopcocks are often parts of laboratory glassware such as burettes, separatory funnels, Schlenk flasks, and columns used for column chromatography.
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| 27. | O = Open stopcock; X = Closed stopcock; black-arrow = Gas flow direction, orange arrow = Liquid flow direction
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| 28. | O = Open stopcock; X = Closed stopcock; black-arrow = Gas flow direction, orange arrow = Liquid flow direction
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| 29. | I had to dash to the stopcock to cut off the water from the tank, so then all my water was turned off.
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| 30. | Apiezon, silicone-based, and fluoroether-based greases are all used commonly in laboratories for lubricating stopcocks and ground glass joints.
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