| [ KAIST ] in KIDS 글 쓴 이(By): caught (꿈의극장) 날 짜 (Date): 2000년 11월 7일 화요일 오후 12시 35분 35초 제 목(Title): Re: 풍선은 왜 떨어지나요? That phenomena might be due to the 'leak' of ballon surface. The helium gas inside ballon diffused out and the air gas diffused into ballon through the leakage path. Accordingly, the gas density inside ballon becomes similar to that of external surrounding. ^^ |