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一、背景“空气有质量”是科学四年级上册第一单元“空气占据空间”中的一部分内容,要求学生用观察、实验等方法认识不易直接感知的空气性质之一——空气有质量,并培养学生细心实验,注重证据,认真思考的科学态度。二、教学仪器铁架台、大小不一的气球、饮料管、棉线、天平、有关空气质量的录像等。三、片断实录(学生活动:学生把杯口朝下垂直倒扣入水中,再慢慢倾斜杯子。)师:你们看到了什么?生:看到有气泡不断往上冒。师:对于气泡往上冒,有什么想法吗?
First, the background of “air quality” is the fourth unit of science on the first unit “air space” part of the content, require students to use observation, experiment and other methods to understand the air quality is not easy to directly perceive one of the air quality and Cultivate students careful experiment, pay attention to evidence, serious scientific thinking. Second, teaching equipment Tiegui Taiwan, the balloon of different sizes, beverage tubes, cotton, scales, video on air quality and so on. Third, the fragment Record (student activities: students down the cup mouth down into the water vertically, and then slowly tilt the cup.) Teacher: What do you see? Health: see bubbles continue to run up. Teacher: Do you have any thoughts on the bubbles going up?