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教学目标:1.指导学生认识大气具有压力,大气压力的方向是来自四面八方;大气压力是随着地势的增高而减小的;大气还有浮力;氢气、热空气等比冷空气轻的气体能在大气的浮力作用下向上升。2.指导学生亲自动手实验,培养他们动手动脑的能力。3.通过实验,发展学生的观察能力和分析能力。重点和难点:大气对物体有压力,物体在大气中受到浮力。教具准备:注射器、玻璃管、玻璃杯、纸片、红色水、滴管、氢气球、口吹的气球。教学过程:
Teaching Objectives: 1. Guide students to understand the atmosphere with pressure, the direction of atmospheric pressure from all directions; atmospheric pressure is reduced with the increase of the terrain; the atmosphere also buoyancy; hydrogen, hot air and other light than the cold air gas Under the buoyancy of the atmosphere to rise. 2. Instruct students to experiment with hands-on exercises to develop their abilities to use the brain. 3. Through experiments, the development of students' ability to observe and analyze. Key and Difficulties: Atmospheric pressure on objects, objects in the atmosphere by buoyancy. Teaching aids to prepare: Syringes, glass tubes, glass, paper, red water, dropper, hydrogen balloon, mouth blowing balloons. Teaching process: