air existing, existing of air, wind - air moving (occasionally with considerable power) from a place of high tension to a location of minimal pressure; "trees bent under the fierce winds"; "when there is not any wind, row"; "the radioactivity was being swept upwards because of the air present https://dominickrjyof.webbuzzfeed.com/36197184/considerations-to-know-about-external-purge-heater-modules