中三超難物理--達人必進

1. No. The "steam" you see is tiny water droplets from the water vapour that condensed in the air. As vapour could come from evapouration of water. The temperature of the water is not necessarily around 100'C.

2. Yes. This is just a result of conservation of energy. If there is a difference between absorption of heat and releasing of heat, then there is a loss of energy. This would violate the energy conservation law.

3. After absorption of heat, the heat energy turns into internal energy possessed by the water. Assume there is no loss of energy to the surroundings, and there is no other ways of losing heat, the heat from the object would all be transferred to the water because of the conservation of energy law.

4. As said above, any absorbed heat is turned into internal energy possessed by an object, i.e. energy due to molecular vibrations (kinetic energy) and potential energy. When an object releases heat, the heat energy comes from the internal energy of the object.

5. Water has a relatively high specific heat capacity. That is to say, any change (either increase or decrease) of temperature of water involves large amount of heat. The ocean has tremendous mass of water, thus the ocean is able to maintain a relatively constant temperature, with only small variation of temperature throughout the year.

In that sense, islands in oceans have small temperature change between winter and summer (e.g. Hawaii, or the Philippines), whereas the inland or coastal regions (like Hong Kong) have marked temperature changes between the two seasons.

1. 吾係，吾一定vaporization(100度由liquid變gas)，冇100度都可以有evaporation，愈高溫evaporate愈多，因為KE of water多，所以chance of water to escape 大
2.係
3.當冇energy loss, 係, 因為conservation of energy,但吾係temperture of object decrease=temperture of water increase wor, 因為object 同water既specific heat capacity 吾同
4.一樣野既internal energy, 係E道講既係溫度上的, 感其實即係kinetic energy of the molecule, 佢會以heat(heat並不是energy, 而是energy傳送既形式)的形式放出黎
5.水既specific heat capacity 高, 所以海可以存好多既energy, 打風(颱風)時可見, 颱風在海時會吸好多energy(i.e. 破壞力強), 上岸離海時因為energy lost又冇補充, 所以漸弱

2009-11-22 22:59:48 補充：
5.當陸地同海既rate of heat lost係一樣時(in winter), 因為水既specific heat capacity大, 所以溫度降得慢, 海較暖. 反之, 當陸地同海既rate of heat gain係一樣時(in summer), 海較涼

1) 不是，呢個係因為個evaporation既關系...根據evaporation既定義就係灘水最表面個層既水從下面既水吸取足夠既internal energy ( 高於沸點所需既能量)，咁就會變態成為水蒸氣而離開個灘水...

2) 是，呢題用番E=mc△T就計得到

3) 唔等於，因為係200度既object放熱既時候，除左放熱比水之外，仲會有heat loss to the surroundings，即係會有熱走左，例如個container或者周圍既環境

4) 係呢題入面應該做左個assumption就係冇heat loss to surroundings，我先叫object做1號，water叫2號 咁你用 m1c1△T1 = m2c2△T2 就應該會計到。你講Heat同internal energy既關應該係Heat transfer既問題，係heat transfer入面，熱D既object會將internal energy釋放出黎，釋放出黎既internal energy就叫heat，所以個object有個heat loss to the surroundings，唔會係internal energy loss to the surroundings，而釋放出黎既internal energy就正正等於heat既量。到absorb個object到喇...佢吸既係heat而唔係internal energy of 之前個object，咁個heat 又會轉為object2既internal energy，呢個就係heat transfer既過程

5) 咁先講夏天，夏天喇，radiation就勁喇...咁陸地吸既energy同海吸既係一樣既...( radiation既係energy唔係heat ) 但係因為水既specific heat capacity高，要較多既能量先會升溫，咁陸地既溫度就會高過海，熱既地方既氣壓會低過凍既方既氣壓 ( 另解喇... ) 咁氣流會有高氣壓地方去低氣壓地方，所以就會做成個向岸風... 咁冬天喇，其實就情況調轉...( 你可能會問水應該都會升溫慢，但係要注意個heat loss，陸地既heat loss比水大 ) 咁因為陸地凍D，海熱D，咁個氣壓就調轉番喇，自然就會有一個離岸風產生...
** 講番氣壓喇，咁其實空氣粒子雖然已經係氣態，但係同起面碰撞既時候，因為都有個temperature differnce，所以會absorb heat from個地面，咁吸得能量多，就會移動得更快，咁就會向上升 ( 所有Heat都係向上升 ) 咁地面既空氣粒子較少，就會同海做成氣壓差別，氣壓既差別就會導致到空氣粒子既流動 ( 因為子少左，咁就要填補 ) 空氣既流動就形成風...

2009-11-22 21:57:42 補充：
其實我係讀英文既Physics，只係覺得用中文會清楚D...如果你想要英文我可以幫你

1.是
2.是
3.是
4.因為兩者的比熱容量相同
5.物體的比熱容量越高，使物體容量上升一度所需的能量就越高，所以令水改變 climate會較困難
本人中7，所以覺得超簡單

1)不是,散發出蒸氣只是水在「蒸發」而不是「沸騰」,不必到達沸點(100度)
以上這題是中一的,所以我會,其他我不會