compressed air

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English Wikipedia has an article on:

compressed air (uncountable)

  1. Air which has been reduced in volume and increased in pressure for use in industrial processes or for cleaning.
    Synonyms: pressurized air, pressurised air
    • 1951 January, “Diesel-Electric Branch-Line Locomotive for British Railways”, in Railway Magazine, page 71:
      Compressed air is used for the operation of certain contactors, the sanders, the horn, and the re-fuelling equipment, but vacuum brakes are fitted to the locomotive.

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