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  2. Fusible alloy - Wikipedia

    en.wikipedia.org/wiki/Fusible_alloy

    Fusible alloys are typically made from low melting metals. There are 14 low melting metallic elements that are stable for practical handling. These are in 2 distinct groups: The 5 alkali metals have 1 s electron and melt between +181 (Li) and +28 (Cs) Celsius; The 9 poor metals have 10 d electrons and from none (Zn, Cd, Hg) to three (Bi) p electrons, they melt between -38 (Hg) and +419 (Zn ...

  3. Rooftop solar power - Wikipedia

    en.wikipedia.org/wiki/Rooftop_solar_power

    Thin film solar is light weight at 7–10 ounces per square foot. Thin film solar panels last 10–20 years [24] but have a quicker ROI than traditional solar panels, the metal roofs last 40–70 years before replacement compared to 12–20 years for an asphalt shingle roof. [25] [26]

  4. Metal roof - Wikipedia

    en.wikipedia.org/wiki/Metal_roof

    Thin-film solar is light weight at 2.1–3.1 kg/m 2 (7–10 oz/sq ft). Thin-film solar panels last 10–20 years [16] but have a quicker ROI than traditional solar panels. The metal roofs last 40–70 years before replacement compared to 12–20 years for an asphalt shingle roof. [17]

  5. Solar shingle - Wikipedia

    en.wikipedia.org/wiki/Solar_shingle

    Tesla Solar Roof. Solar shingles, also called photovoltaic shingles, are solar panels designed to look like and function as conventional roofing materials, such as asphalt shingle or slate, while also producing electricity. Solar shingles are a type of solar energy solution known as building-integrated photovoltaics (BIPV).

  6. Rose's metal - Wikipedia

    en.wikipedia.org/wiki/Rose's_metal

    Rose's metal consists of 50% bismuth, 25–28% lead and 22–25% tin. Its melting point is between 94 and 98 °C (201 and 208 °F). Its melting point is between 94 and 98 °C (201 and 208 °F). The alloy does not appreciably contract or expand on solidification, this characteristic being a function of its bismuth percentage, but does slightly ...

  7. Reflective surfaces (climate engineering) - Wikipedia

    en.wikipedia.org/wiki/Reflective_surfaces...

    To qualify for a rating, roofing materials must have a solar reflectance of at least 0.65 and thermal emittance of at least 0.90. As many as 10 points may be awarded for 1–100 percent roof coverage with either vegetation or highly reflective materials or both.

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