我想問點先知到水係幾時蒸發??有咩條件??
蒸發時溫度一定下降嗎?
為什麼冰melting時..會有一絲絲像煙的水氣呢??
另外..還有一大堆問題..識就答下..唔識都睇下...thx!!
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物理的高手們都到那兒去??(入來吧)
2007-12-25 7:16 am
回答 (3)
2008-01-09 4:33 am
✔ 最佳答案
條件T>0,蒸發不等於氣化,氣化條件在1atm時是100'C,由於在水分子中有不同的動能,蒸發只由於部份水分子有足夠的KE可以脫離水的吸引力,
失去的KE在air中get,
一絲絲像煙的水氣是ice get左air中水氣的E,使水粒子凝結成水點,使人看到
2007-12-26 2:05 am
chem: completely break the H bond
phy: reach boiling point
ie. water molecule gain enough KE against air pressure and surface tension
temperature:
keep constant during vaporization e.g.煲水,
decrease during evaporation e.g.出汗
water vapor in air condense to water in air, becoming fog
2008-01-07 21:18:43 補充：
咁有什麼能量令水氣向上升呢??擴散作用difussion
phy: reach boiling point
ie. water molecule gain enough KE against air pressure and surface tension
temperature:
keep constant during vaporization e.g.煲水,
decrease during evaporation e.g.出汗
water vapor in air condense to water in air, becoming fog
2008-01-07 21:18:43 補充：
咁有什麼能量令水氣向上升呢??擴散作用difussion
2007-12-25 7:41 am
when the water molecules on the surface gain enough kinetic energy from the neightbouring molecules, they gain enough energy to escape as water vapour.
conditions:at any temperature, on water surface, no bubbles is formed
temperature is the average KE of an object, when the water molecules escape, average KE decreaes, so temperture decreases.
conditions:at any temperature, on water surface, no bubbles is formed
temperature is the average KE of an object, when the water molecules escape, average KE decreaes, so temperture decreases.
參考: me
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