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  2. Duct (flow) - Wikipedia

    en.wikipedia.org/wiki/Duct_(flow)

    Aluminium tape is applied to all seams where the external surface of the aluminium foil has been cut. A variety of flanges are available to suit various installation requirements. All internal joints are sealed with sealant. Aluminum is also used to make round spiral duct, but it is much less common than galvanized steel.

  3. Hot foil trick - Wikipedia

    en.wikipedia.org/wiki/Hot_foil_trick

    The hot foil trick is a magic trick in which the magician places a small piece of tin or aluminium foil in a volunteer's hand, and the foil begins to rapidly increase in temperature until the volunteer has to drop it to avoid scalding their hand, and the foil is reduced to ashes on the ground.

  4. Ferromagnetism - Wikipedia

    en.wikipedia.org/wiki/Ferromagnetism

    Permanent magnets are made from hard ferromagnetic materials (such as alnico) and ferrimagnetic materials (such as ferrite) that are subjected to special processing in a strong magnetic field during manufacturing to align their internal microcrystalline structure, making them difficult to demagnetize. To demagnetize a saturated magnet, a ...

  5. Trickle vent - Wikipedia

    en.wikipedia.org/wiki/Trickle_vent

    A trickle vent is a very small [quantify] opening in a window or other building envelope component to allow small amounts of ventilation in spaces intended to be naturally ventilated when major elements of the design—windows, doors, etc.—are otherwise closed.

  6. NASA used kitchen aluminum foil to save a legendary ... - AOL

    www.aol.com/news/2017-09-29-nasa-used-kitchen...

    For all of NASA’s high-tech advancements, it may surprise you to know that the agency used regular kitchen aluminum foil to save one of its most famous missions.

  7. Alnico - Wikipedia

    en.wikipedia.org/wiki/Alnico

    Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 °C (1,650 °F) to 800 °C (1,470 °F), near the Curie point. There are local anisotropies of different orientations without an external field due to ...