唔該，幫幫手啦，好緊急呀１／６要交啦一千個唔該
１為什麼潛水艇在能水中升降？
２為什麼在厚厚的冰下的水中，生物不會冷死？
３怎能令波子浮在水面？
４為什麼湯圓剛在放到水中是時沉，然後會浮起？
５為什麼肥皂泡總是先上升，後下降呢？
６為什麼熱氣球和氫氣球都不會一直向上升至太空？
７為什麼熱水不能倒進厚的玻璃杯內？
８按國際乒聯規定，乒乓球拍的厚度不能超過４ｍｍ．為什麼同一塊球拍在中國是接納的，但在雅典會視為違規？
９為什麼把煮熟後的雞蛋放進冷水後，會較易剝殼?
科學（冷縮熱脹和密度的應用）好緊急呀１／６要交啦，幫下手啦！！
2008-05-31 6:23 pm
回答 (2)
2008-05-31 6:45 pm
✔ 最佳答案
因為當潛水艇要升時佢會釋放大量氧使密度低過水
所以就升
相反就整走空氣-
因為水到左0度就會結成冰
但係係4度時佢既密度反而會高左!
所以冰就好似一個保護層
令冰下既魚唔會凍死
3 唔知
4 唔知
5 唔知
6 唔知
7 因為厚的玻璃杯傳熱慢
同時冷縮熱脹
當熱水一入到佢個玻璃杯入面就脤得超快
但係出面就好慢
所以就唔平衡
最係會爆
8 唔知
9 唔知
2008-06-02 1:35 am
6:situation 1.
Because the air in the upper layer of sky is very weak and thin(low amount of air),so when the ballon reach there,the air pressure in side the ballon is larger than outside,then the ballon will expand and blow out.
Situation 2:
Low air in the upper layer,so the layer is very cold and the ballon will dense and can't go throw the sky.
Because the air in the upper layer of sky is very weak and thin(low amount of air),so when the ballon reach there,the air pressure in side the ballon is larger than outside,then the ballon will expand and blow out.
Situation 2:
Low air in the upper layer,so the layer is very cold and the ballon will dense and can't go throw the sky.
參考: from my own knowledge
收錄日期: 2021-04-13 15:38:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080531000051KK00650