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> 如图是“雨的形成”实验装置,用酒精灯将烧瓶内的水加热沸腾后,水蒸气从细玻璃管口喷出,在离管口稍远处,可以看到雾状的“白气”。如果这时在管口处放置一块玻璃片,会发现正对-八年级物理
如图是“雨的形成”实验装置,用酒精灯将烧瓶内的水加热沸腾后,水蒸气从细玻璃管口喷出,在离管口稍远处,可以看到雾状的“白气”。如果这时在管口处放置一块玻璃片,会发现正对-八年级物理
题目简介
如图是“雨的形成”实验装置,用酒精灯将烧瓶内的水加热沸腾后,水蒸气从细玻璃管口喷出,在离管口稍远处,可以看到雾状的“白气”。如果这时在管口处放置一块玻璃片,会发现正对-八年级物理
题目详情
如图是“雨的形成”实验装置,用酒精灯将烧瓶内的水加热沸腾后,水蒸气从细玻璃管口喷出,在离管口稍远处,可以看到雾状的“白气”。如果这时在管口处放置一块玻璃片,会发现正对管口的玻璃片表面有_______,玻璃片的温度将_________(选填“升高”、“降低”或“不变”)。我国是水资源严重缺乏的国家,节约用水应从我做起,请你写出日常生活中的一项节约用水措施:
。
题型:问答题
难度:偏易
来源:不详
答案
小水珠(小水滴);升高;二次用水等
试题分析:水沸腾后产生大量的水蒸气,水蒸气遇冷液化成小水滴形成“白气”;如果这时在管口放置一玻璃片,水蒸气遇冷液化成的小水滴附着在玻璃片上,玻璃片的温度将升高,因为液化放热.二次用水是节约用水措施之一。
点评:本题主要考查学生对液化及其现象,以及液化放热的了解和掌握,是一道基础题.
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题目简介
如图是“雨的形成”实验装置,用酒精灯将烧瓶内的水加热沸腾后,水蒸气从细玻璃管口喷出,在离管口稍远处,可以看到雾状的“白气”。如果这时在管口处放置一块玻璃片,会发现正对-八年级物理
题目详情
答案
试题分析:水沸腾后产生大量的水蒸气,水蒸气遇冷液化成小水滴形成“白气”;如果这时在管口放置一玻璃片,水蒸气遇冷液化成的小水滴附着在玻璃片上,玻璃片的温度将升高,因为液化放热.二次用水是节约用水措施之一。
点评:本题主要考查学生对液化及其现象,以及液化放热的了解和掌握,是一道基础题.