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  2. Copper tubing - Wikipedia

    en.wikipedia.org/wiki/Copper_tubing

    Type Z is a thinner walled pipe, also used for above-ground service, including drinking water supply, hot and cold water systems, sanitation, central heating and other general purpose applications. In the plumbing trade, the size of copper tubing is measured by its outside diameter in millimeters.

  3. Pulse tube refrigerator - Wikipedia

    en.wikipedia.org/wiki/Pulse_tube_refrigerator

    Below 10 K one uses magnetic materials which are specially developed for this application. The so-called coefficient of performance (COP; denoted ξ {\displaystyle \xi } ) of coolers is defined as the ratio between the cooling power Q ˙ L {\displaystyle {\dot {Q}}_{\text{L}}} and the compressor power P .

  4. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    A refrigerator maintains a temperature a few degrees above the freezing point of water. The optimal temperature range for perishable food storage is 3 to 5 °C (37 to 41 °F). [3] A freezer is a specialized refrigerator, or portion of a refrigerator, that maintains its contents’ temperature below the freezing point of water. [4]

  5. Refrigeration - Wikipedia

    en.wikipedia.org/wiki/Refrigeration

    The most appealing part of this research is how potentially energy efficient and environmentally friendly this cooling technology is. The different materials used, commonly shape-memory alloys, provide a non-toxic source of emission free refrigeration. The most commonly studied materials studied are shape-memory alloys, like nitinol and

  6. This Is the Safest Temperature for Your Refrigerator - AOL

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