《升华和凝华》PPT课件.ppt

固态气态 升华 凝华 升华吸热，凝华放热 在严寒的冬天,一直冰冻着的衣也会变干 放在衣厨中的樟脑丸越来越小 寒冷的冬天,在窗玻璃上会有冰花 电灯泡用得时间长了,电灯泡上会发黑 生活中的应用 在深秋初冬早上的地面常会出现霜,人们常说 道:“下霜了!”你是如何评价这种说法的 干冰升华 人工降雨常用的物质是什么?其原理是什么? 人工降雨的全过程经历了哪些物态变化? 干冰升华 水蒸气凝华 小冰晶熔化 雾凇 物态变化 下列说法正确的是 A 云是由水蒸气升入高空时遇冷凝结成的小水珠和 大量小冰晶组成 B 雾是飘浮在空气中的大量的水蒸气 C 露是大量小冰晶吸热熔化形成的小水珠 D 霜是空气中的水蒸气凝华而成的大量的小冰晶 只吸热不升温的物态变化是 测量200摄氏度高温物体和 50摄氏度的物体应分别采用 什么温度计？（水银温度计，酒精温度计） 填出下列物质吸热时温度的变化情况 (1) 20 摄氏度的冰吸热，温度将 （2）0摄氏度的水吸热，温度将 （3）0 摄氏度的冰水混合物吸热，温度将 海波的熔点是48摄氏度，所以48摄氏度的海波 A 一定是固态 C 一定是固液共存 B 一定是液态 D 以上三种均有可能 将一块-2摄氏度的冰放在3摄氏度的水中，过一会还剩下小块 冰留在水中，则这时水的温度是 冰的温度是 戴眼镜的人和开水时镜片上会蒙上一层白雾，为什么？ 从嘴里呵气到手背上会感到热，而从口中吹出的气到手背 上却感到凉，为什么？ 1 归纳物态变化表 2 各种物态变化（共6种）分别举例2到3个，并说明。 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