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  1. Hot air is of density much lower than ambient air , thus has a tendency to... force to the balloon. The mathematical analysis of a hot - air balloon is as follows: Let V be the volume of the balloon...

  2. A hot air balloon for manned flight uses a single layered, fabric... the critical property, not mass and not weight. {Note 2} ( Hot air ) - The density of a gas can be reduced by ...

  3. ... constantly heated NON-UNIFORMLY by solar radiation. Hot air in the atmosphere does rise and cold air sinks. This produced...

  4. ...necessarily be 100%. 2010-02-28 00:52:46 補充: 3. As said above, when hot air touches cold air . The hot air would be cooled down by the cold...

  5. ...形態就會轉變為液態, 亦即係變成霧啦.... 相反, 空氣遇熱, 份子就變得活躍...而 hot air 中既份子活動範圍較大, 咁係一個範圍內既份子數量亦較少...所以當霧遇到大陽...

  6. ...]) Therefore, high pressure centres are always hot . However, when moisture in the air rises evaporate to the atmosphere, cloud may forms and produce rainfall...

    分類:科學及數學 > 地理學 2008年10月19日

  7. ... to decrease the temperature of the whole room would be longer. Since hot air is not as dense as cool air , so that hot air will stay near the top of the room...

  8. ... will remain at floor level, because cool air has higher density than hot air and thus sinks. Under such situation, only your feet feel...

  9. 1. Light-coloured surface reduces heat loss of the hot air inside the balloon by radiation. This is to prevent rapid cooling...

  10. ...these 2b. marbles 3a. these 3b. kites 4a. that 4b. hot air ballon / hot - air balloon change to -----> 1a)一個人攞住一個... is that ?」 4b)女仔講「It is a hot air balloon / hot - air balloon .」

    分類:社會及文化 > 語言 2007年09月30日

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