死啦~我都問過教我phy o既阿sir呀~
同大家分享o下先~我未係好明阿sir講乜~哈哈~
不過我講果一套都好似未係完全正確~
但可以肯定o既係..utopia講o既係o岩o既..
就係真空狀態下..水會好快蒸發..
以下係phy阿sir回覆我e-mail o既答案..仲有我o既問題~
阿sir呀..想問o下你呢..水向底流哩個係人人都知o既道理..
但o係真空狀態下又會唔會實現呢..!?
有人提出高水有高位能..所以會向下流動..
如果設計一個實驗..放一盤水o係高處..
然後用一條注滿水o既管"引水"..
唔知會唔會都係向底流呢..!?
(假設水管o係盤入面係o係最低處..而出水口亦o係同一個水平..
以至壓力平衡..)
ps.真空狀態下冇大氣態力..咁水係咪會定住o係果度..!?
因為屋企做唔到真空態..所以做唔到實驗..如覺得問題愚蠢..見諒~^ ^~
阿sir o既回覆:
1. The common sense you mentioned is a result of potential. You know, water
at high level has potential energy. Hence it trends flowing to low level.
2. Potential is due to the effect of gravity. Gravity still exists even in
vacuum, e.g. gravity on the earth by the sun transimits through earth-sun
space.
3. The answer for your second question is "yes". (Reason same as above.)
4. You can't test for the assumption because "same level" is only drawn from
a rough sense. So, it's chance to observe water coming out.
5. Actually, no vacuum observe if there is water present. Because water will
evaporate even in vacuum.
WTP
ps.好鐘意今次o既討論~好開心~得著唔少~
期待有下一次~
