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Air frost

the deposition of ice condensed from water vapour in the atmosphere on the surface when the air temperature is below 0°C


Read Also:

  • Air gap

    Electricity. the space between two objects magnetically related, as between the rotor and the stator in a dynamo, or between two objects electrically related, as between the electrode and the tip of a spark plug. Historical Examples We want our magnet to project, as it were, its force across the greatest length of air gap. […]

  • Air gas

    Chemistry, . a gas composed of carbon monoxide, hydrogen, and nitrogen, obtained by passing air and steam through incandescent coke: used as an industrial fuel, in certain gas engines, and in the manufacture of ammonia. noun another name for producer gas noun a mixture of carbon monoxide and nitrogen produced by passing air over hot […]

  • Air gauge

    a gauge for measuring air pressure. Historical Examples Two minutes previous the old engineer had asked him to go out on the locomotive to adjust some fault in the air gauge. Ralph on the Engine Allen Chapman

  • Airglow

    a dim light from the upper atmosphere caused by emissions from atoms and molecules ionized by solar radiation: observed at night (nightglow) during the day (dayglow) and at twilight (twilight glow) with each having slightly different characteristics. noun the faint light from the upper atmosphere in the night sky, esp in low latitudes airglow (âr’glō’) […]

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