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subject 불붙여도 터지지않는 고무풍선
writer UMAGIC (ip:)
date 2009-05-12
물이든 풍선을 가열하면 터질까?



물이든 풍선과 물이 들어 있지 않은 풍선에 열을 가했을 때 어떤과학적 원리가 숨어있는지 대해 알아봅시다.

준비물: 고무풍선, 라이터



실험방법

① 입으로 불은 풍선과 물을 채운 풍선을 준비한다.
② 공기를 채운 풍선을 라이터 불로 가열한다.
③ 학생을 앞으로 나오게 한다.
④ 물이 들어있는 풍선을 학생머리에 올려놓고 불로 가열한다고 설명한다.
학생들을 긴장하게 해야 한다.
⑤ 라이터 불로 풍선의 아랫 부분을 계속 가열한다.

실험결과

① 물을 채우지 않은 풍선은 압력을 이기지 못해 바로 터진다.
② 물 풍선을 라이터 불로 가열해도 물 풍선은 터지지 않는다.


왜 그럴까?
...........................................................
이 실험은 매우 간단한 실험이지만 물의 열용량을 설명하는데 매우 흥미롭고 적합한 실험이다.
종이컵 가열하기 실험과 마찬가지로 소재만 종이에서 고무로 바뀐 것이다.
풍선의 고무는 열을 가하면 약해진다. 물이 없는 경우에 고무를 가열하게 되면 어느 순간 풍선 안의 공기의 압력을 견딜 수 없게 되어 터지게 된다.
그러나 물이 들어 있는 풍선을 가열하게 되면 물은 열을 흡수하게 되고, 고무의 온도는 100℃이상으로 올라갈 수 없게 된다. 또한 고무는 풍선의 내부압력을 견딜 수 없을 정도까지 약해지지 않는다.



위 내용은 모 학교의 과학마술 리포트를 퍼온것입니다.
연출하기에 따라서는 대단한 효과를 보여줄 수 있을겁니다
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Tel : 010. 2967. 7275
        031. 391 .4784
fax : 031-688-8916
월 - 금 / 10:00 am - 6:00 pm
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토, 일, 공휴일 쉽니다.
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