This is the 9932nd most frequent Korean word.
공기청정기
Air purifier.
Here, '공기청정기' functions as the subject of the sentence and refers to the physical device for air purification.
공기청정기가 거실에 있어요.
The air purifier is in the living room.
In this sentence, '공기청정기' is the object of the sentence and refers to the item being purchased.
나는 공기청정기를 새로 샀어요.
I recently bought a new air purifier.
Here, '공기청정기' represents the subject of the general statement, indicating a trend or observation about air purifiers.