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近日一架从峇里岛飞往澳洲的捷星航空（JetStar）班机，才起飞不久机舱内就冒出阵阵白烟，乘客纷纷被眼前白烟吓得惊慌失措，以为是飞机故障！不过，其实“真相”就不过是一种自然现象，那就是“冷凝”。

面对着惊慌失措的乘客们，空姐赶紧解释说这不过是冷暖空气交流时的自然现象。

空姐通过广播解释，“各位女士、先生，由于空调温度像是冬天般寒冷，当外头暖空气进入飞机内，就会产生冷凝的现象，请乘客切勿担心，等我们到达了一定高度，冷凝现象就会清除了。”

有乘客将白烟冒出的状况拍下上传至Youtube，吸引了许多人观看。从曝光影片中可看到，有乘客开玩笑表示，“嘿各位，我觉得我们的飞机上有干冰，我想我在做梦。”

事后，捷星航空发言人指出，当客机在暖空气与冷空气之间飞行时，机舱内会发生冷凝，在这种情况下，温度差异会影响冷凝现象的范围，不过，乘客不必过度担心。

何为“冷凝”

冷凝（Condensation）是气体或液体遇冷而凝结，如水蒸气遇冷变成水，水遇冷变成冰。 温度越低，冷凝速度越快，效果越好。冷凝和蒸发是作用相反的两个物理过程。

基本上，从原理上来说，汽车玻璃起雾原因也是同样的现象，乃车内热空气遇到冷玻璃促成水汽凝结在玻璃内侧。