Instead of going out for a cup of coffee, try this creative twist of NESCAFE Classic at home.
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The tube's high heat dissipation heats the glass walls to several hundred degrees Celsius. Any dirt or impurities are then drawn out by the vacuum pump in their gasified form. This method is most effective for removing gases that have adsorbed on the tubing's inner wall, including oxygen, carbon dioxide and water vapor. Bright orange incandescent colors are also produced by the current, which heats the electrode metal to 600 degrees Celsius. The cathodes consist of prefabricated hollow metal shells that have a small opening (sometimes called a ceramic donut aperture). Inside the shell, a small amount of a cold cathode powder with low work function (usually a powdered ceramic molar point mixture including BaCO2) is incorporated.
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