noun
air current; airflow; atmospheric current
Refers to the movement of air, whether natural (wind, drafts) or in scientific/technical contexts (aerodynamics, ventilation).
飛行機は強い気流に巻き込まれた。
The airplane was caught in a strong air current.
この部屋は気流が悪くて、空気がこもりやすい。
The airflow in this room is poor, so the air tends to get stuffy.