상온에서도 입김이 난다? [핫클립] / Ytn 사이언스
Synopsis
입을 다물고 30초간 우물우물하고 손으로 입을 누른 뒤 벌리면? 하얀 입김이 구름처럼 몽실몽실 올라오는데, 과연 그 원리는 무엇일까 ...
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